STEFF: Agreed 4500 carbs are better- thats been well covered i think .
For the guys that run classes where those are not allowed, one can either stop racing, change car and class or- look at every opportunity to squeeze as much as you can out of your combo.
There are very, very fast cars/boats etc running 4150 flange carbs and cfm's at or above 1450 na.
fwiw