In AHRA it would have been either B/S-A Formula 1 or C/S-A Formula 1. Formula 2 was for the tri-power and Formula 6 was for a 4-barrel. I don't think NHRA allowed non-standard carburetion in stock classes. My guess is that it would have run in B-Gas in NHRA. I saw a guy run a '64 4-spd without his front bumper and they put him in A-Gas.
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