what carb

You'll need to be more specific with what you are looking for here. If you just want to know what others have, that is fine, but without knowing their specific combinations, you could be setting yourself up for a lot of problems. For instance, my little 347 has a 950 cfm 4150 style carb on it, but I can tell you that there are A LOT of 408's that would run like crap with it. What heads do you have? Compression, cam, shift RPM, Intake, etc.? If you have a low RPM mild setup, it could NEED as little as a 750 cfm that is box stock. However, you could have something that uses some RPM and could NEED 1000+ cfm. Too much or too little for what you have will make it run like a turd.
 
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