This particular carb, and all 1975-79 Pontiac M4M Quadrajets, has 1/4" NPS threads for a 1/4" NPT fitting.
1974 and earlier Pontiac 4M Quadrajets has 1/8" NPS threads for 1/8" NPT fittings.
FWIW
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1966 GTO Tri-Power
1970 GTO TheJudge
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