Rochester 2GV Bad Hesitation

HELP! I have a 1971 Dart Swinger with the 318 and a Rochester 2GV on top. I have replaced everything from the head gaskets up on this engine - hardened seats, coil, plug wires, plugs, cap, rotor, points conversion, fuel pump, fuel filter, rubber fuel lines, and had the carb rebuilt. I have run a compression check and it shows about 120lbs average and a steady 17-18 inches of vacuum out of the intake. Now here is the problem. I can start the engine and let it warm up and it idles fine. If i quickly crack the throttle it hesitates really bad and will die if i dont release. If i slowly open the throttle it will studder until about 1/4 throttle then straighten up some. It is alot worse when I try to move the car. If i hold my hand over the carb and adjust the air entering the carb with my fingers, It runs great. I have talked with the guy that rebuilt this carb and i just as well talk to the wall. Am I over looking something or does it seem that the engine is needing more fuel? and if so what can i do to fatten it up?

Thanks for your help!!!

Shannon