Application is '69 440 with A/C, which means AT as well.
I don't recall exact CFM, but I don't think it's much more than 650; (383 carbs were less, FWIW.)
I'd lean towards either a new Eddy AVS2 (650-800 CFM) for a modified street engine, better carb than the old tooling & boosters. Under $400.
Some T-quads flow 850 CFM, and the small primaries are nice at part throttle, but you'd need an adapter or a different intake.
Lots of guys prefer Holleys, too. More spendy, + fuel line, kinda more of a race carb, generally speaking.
Tuning any of the Carters seems counter-intuitive to some folks; you have to understand the metering rods, but it's simple & easy once the light comes on.