Well, it passed the censor. In that case will try another.

ChevyAsylum - Carter recommended the use of AFB number 9400 or 9410 (w/EGR port) 400 CFM for use on the Chevy 283. While a 625 can be used, low RPM power and torque will suffer somewhat when compared to that produced using the smaller carb due to lower air velocity on the primary side.

Carter AFB CFM (aftermarket carbs)

400 = 200 P and 200 S
500 = 225 P and 275 S
625 = 250 P and 375 S
750 = 375 P and 375 S

Jon.

Good carburetion is fuelish hot air
The most expensive carburetor is the wrong one you attempt to modify.
If you truly believe "one size fits all," try walking a mile in your spouse's shoes!
The Carburetor Shop