Bob,if your going to run a open hood with a SD scoop you can virtually use any AFBs.DONT cut the hood until you have the engine in and intake and carbs mocked up.I have a factory Ford-SD scoop on my 63 Lemans.The 60s pass car Pontiac AFBs I dont believe are big enough.I think they are in the 500s,the 62-63 SDs are 625 and the SD NASCAR carbs are 750.John(61-63) could give you some buick and chevy numbers that are 625s.Tom
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