CFM 318 2 Barrel Carb ???

Copied and pasted from elsewhere here. CFM by the factory wet flow rating.
2-Barrels

273 ~ {1964 thru 1969}
Carter BBD {1.437" Throttle Plates x 1.063" Venturi}.......... 275 CFM Rating

318 ~ {1968 and up}
Carter BBD {1.437" Throttle Plates x 1.186 Venturi}............ 285 CFM Rating

360 ~ {1971}
Holley {1.563" Throttle Plates x 1.343 Venturi}................... 350 CFM Rating

383 ~ {1962 thru 1971}
Carter BBD {1.563" Throttle Plates x 1.313" Venturi}.......... 365 CFM Rating

400 ~ {1972}
Carter BBD {1.563" Throttle Plates x 1.313" Venturi}......... 365 CFM Rating