The SD ACs on the dual quads won’t fit the 3 bbl.The 3 bbl has the large top and was only used on Super Speedways and I’m sure used a custom NASCAR approved AC.The 4 bbl NASCAR Carter AFBs were used on non Super Speedway cars.I run a pair of them on my Bathtub.I know Pete’s book has the number for the 63 version.When I get home I can give you the number.Off hand I think 4473.Tom
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