A 750 is to big a carb for a 302-306. A 600 would do fine or maybe step up to a worked 600 like a aed or proform. A 750 would be for a drag...
i think you have a descent combo in mind. I would not go with the afr 185s. I have two friends one has the 165 and one has the 185. The smaller...
last motor i built was a 408 I only had a 750 aed holley. I forget the math on it but a 650 will be plenty for a 347. Might go for mech...
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