770 CFM on a 383 w/200 cc runners 2.02/1.60 1 5/8 to 3" headers, true duels 2.5" no crossover. Air Gap RPM intake 6AL

From idle to WOT, shotters shoot, Revs goup then bang, total hesitation. Timing and elec are fine. Maybe the acc. punp, but I'm not sure. Float levels are fine, max mani pressure. If at higher RPM or Rs coming down. tire (grrr) spins. Any suggestions would be appreciated. Holley say Acc. pump may be the issue

 

ok i have a 406 same set up allmost i had the same problem switch you front jet to the back and put like a set of 68 in the front so it should be like this 68 in the front and like 72s in the back and back the nut off on the accl pump a little and you mite have to switch advace springs in the disributor to a set of lighter one i did all that and it helped a **** loadthe springs helped a lot on mine it will burn them off in first gear at 30mph if i punch it and inialate them it i start from a stand still