Still working the bugs out of my new 383. After sending the "stock" style Mopar Electronic ignition back to Jegs and ordering a Pertronix Flamethrower Distributor with ignitor III it is running again. It seems to run great except for a flat spot right off idle. If I really stab the throttle fast it will actually die. I'm not sure where to start because I have never really had it running perfect since I built the motor. Any suggestions...Carb? Ignition? Timing? I have tried setting the initial anywhere between 12-16 and it made no difference. I don't know what the full advance is going to. I put the lightest springs in the vacuum advance tonight and I will see if it makes any difference tomorrow.