This particular Carb was only on the lower HP 440s in 71.
It flows around 625/630 CFM as delivered. It has the smaller 7/16
primaries like the 68 to 70 340 AVS carb unlike most other 440 AVS carbs
with 11/16 primaries.
With some booster changes and other sneaky machine work to carb Gurus can get them
to 710 to 720 CFM.
My .02 = for Free