I have so much to share that I'm going to push the tuning links back to Part IV or even Part V. I haven't even got to the other good part- the EFI part!
A few people have asked what a Weber IDF system might cost I can estimate it but it depends upon a lot of variables, such as where you buy the carburetors, what linkage you run, if you want an expert to set it up, what jets you need, etc. Webers were never cheap, so you should stick with that 4-bbl if you like things cheaper and simpler. Here's some quick up-front costs for example:
1. Manifold: $925 AUD. I heard the actual price might be a little less since shipping is included to anywhere in Australia.
2. Carburetors: Expect to pay anywhere from $330 to $400 each, and you need four. Expect to be around $1400 to $1650 with shipping.
3. Linkage: Kits range from $150 to $250. Some amount of fussing may be necessary.
4. Base Gaskets: $3 each and you need one for each carb barrel, eight total.
5. M10x1.0 to AN-6 adapters: 8 x $7.45. Note that this adapter is specific to the IDF; the IDA uses a larger adapter.
6. Fuel lines, fittings, etc: $150 or more, depending upon what fittings are used and how they are routed.
7. Air Cleaners: $36 each, need four, http://www.piercemanifolds.com/product_p/99217.348g.htm That's not the only air cleaner around for IDF's.
8. Fuel Pressure Regulator: Holley, $29. http://www.summitracing.com/parts/hly-12-804/overview/
9. Sync tool: $44 from Pierce Manifolds. Most people like the snail
10. Jets: See links below. One jet can be $5, an emulsion tube is $10, and there is a main jet, emulsion tube, idle jet, etc. for each barrel (two per carb). You can see how this could add up quickly.
11. 02 Sensor, Innovate LC-1 was recommended to me. $200, and you can also get a Speedhut air/fuel ratio gauge to use with it.
You can see that the list of parts can easily add up to over $3000. If I missed something, send me a note or comment. Julian K. received a quote from a dealer for $2050 which included four carbs, braided fuel lines, insulating gaskets, and an IDF linkage kit. There was a good discount for a group buy, too.
Good Links to Suppliers and Information
http://www.aussiespeed.com The place to find the Cleveland-specific Weber IDF manifold.
http://www.racetep.com A great place to look at linkage. Racetep also sells carburetors and will price match.
http://www.cbperformance.com Another place to buy carburetors. The company mostly caters to the VW crowd.
http://www.redlineweber.com A popular place to buy carburetors and accessories.
http://www.piercemanifolds.com Another popular place to buy weber carbs and parts. I know of some people who bought their setups from Pierce Manifolds.
http://www.inglese.com/ The carburetor pricing is a bit steep but linkage kits are available that could be tailored to the IDF setup on the Aussiespeed manifold.
http://jiminglese.com Jim started Inglese Induction, as you can read on his website. I have personally talked to Jim on more than one occasion, and he is a great source of info. He told me that he would prefer that you buy your setup from him (naturally) but he is willing to set the whole thing up for you on your manifold with your parts, save for the linkage. He wants to assemble his own linkage. Labor for total assembly will probably be somewhere north of $1000, but you must contact him for a quote.
http://vwparts.aircooled.net/Fuel-System-VW-Carburetors-s/169.htm Great for parts, but geared toward the VW crowd.
http://www.aircooledengineering.com Shop local to me. The guys admittedly don't do any V8 work but I coaxed a good amount of info from them. The carb tuner guy was very friendly and eager to see my car. I know where I'll be going for jets and advice.
http://www.anplumbing.com AN fitting online store with carburetor adapters for Webers.
M10x1.0 to AN-6 fuel hose adapters for adapting to braided flex hose are sold by many companies, but you can get them thru ANplumbing.com, Part Number 991953 for the Earls blue version with washer. (AT991953 gets you the black hard-anodized version) You can also get all your plumbing parts and hose thru the same company for reasonable prices. I can't tell you exactly what you need since every situation might be a little different.
The fuel pump is a very important part of Weber carbs. Weber carbs are built for 3 psi and not much more. More fuel pressure will actually lift the needle off the seat in the fuel bowl, potentially causing flooding. It would be ideal to run a low pressure, high flow pump with these carbs, but some people just recommend a cheap Holley pressure regulator and a high flow, lower pressure pump. Holley Pressure Regulator. Note that the Holley has two oulets and no return plumbing. I've seen some carburetors plumbed such that each side of the regulator feeds each bank of carburetors.
Carter also makes a low-pressure, high volume pump that comes recommended by a couple websites I found. Part #4070. I don't know if it's truly better since I believe Jim Inglese told me to just use a quality mechanical fuel pump in conjunction with a fuel pressure regulator. http://www.racetep.com/webfuelspark.html Note what Racetep says about the Holley regulator on the same page. Seems to conflict with what I understood from Jim Inglese. I'll follow up with a phone call to Jim to confirm.
A good liquid-filled gauge of a small enough range to be readable is also recommended such as this gauge.