Carb Help Holley Vs Edelbrock

[jes72mustang]

I am looking for opinions with reasoning. I currently have a 72 Mustang Coupe with, 351C that is nearly stock, It has an Edelbrock performer intake manifold. Holley 750 Double pumper, MSD pro Billet Dist, Crane Fireball Ignition. THis was the set up when I bought it, I have not done anything to the engine yet.

I am being told by several people that the Holley 750 is too big for the engine, and that eevn after I start working I probably will not need more than a 650. So I am trying to decide whether to go with another Holley or and Edelbrock Performer Carb. I would like to make a good informed decision and possibly buy the new carb when I go to the spring carlisle swap meet.

The mechanic that did my tranny rebuild swears by Edelbrock, My brother-in-law perfers Holley. Can I get some other input?

[restomod]

The 750 cfm is not really too large if you plan to increase your hp. A dual plane manifold (yours) requires approx 20% more air flow to get max performance over a single plane. In your case the double pumper may be too much (not designed for stock engines) for your current set up. If you had a basic 750 Holley and not the dp, then you would be fine.

I prefer Holley over Edelbrock carbs.

[mustangmike351c]

<LI class=first>www.hotrodders.com/kb/engine/calculators.html <LI class=first>check this site out it can help you with your decision

[jes72mustang]

Thanks for the input Guys. I am going to research this for a little while before making my decision. After having the tranny rebuilt and some other work this month, The wife has kind of limited my car spending for a while. So I am now in research and planning mode.

I Will check out the link about as well.

[MagicRat]

Keep the Holley carb. But consider converting it to vacuum secondary actuation. This is easy. Holley sells a kit just for this application. The vacuum secondary mechanism helps prevent you from over carbureting the engine.

Also consider leaning out the primary jets, unless you know this was already done. Every aftermarket Holley carb was jetted too rich from the factory. You will find your power and economy both will improve.
I use a Holley 750 vacuum secondaries on a built-up Olds 455 and on a Pontiac 400. Both carbs were too rich, even for those engines. I had to drop 2 steps leaner on the jets. Even then, another drop leaner is probably warranted.