Personally, I would choose a 750 CFM Holley or Road Demon. The vacuum secondaries make for good drivability. If you leave the 351C completely stock, you probably could do with a 625-650 CFM carb even. If you mod it much, I believe you'll want 750 CFM for the 351C.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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