I have been having a slight problem with the 350 in my 83 Monte. Off idle with you give her throttle quickly she hesitates badly then revs. Also if im just cruising and stomp on her, big hesitation then she takes off like a R4ped ape. I changed the accelerator pump discharge nozzle a total of 6 sizes from what the carb came with. It seems to be rpm related because if shes running above ~2,000 rpms there is no hesitation. Anyone have an idea? or should i just go up a couple more sizes on the discharge nozzle? hate spending the $11 every time just see >< lol.

victor jr air gap intake
Holley 750 carb
unilite dist
Mallory ign
intake vacuum ~15 lbs @ 600 rpms (idle)