66 300 with a 383. Brand new edelbrock 650 with long tube headers, msd distributor & new plugs & plug wires. It starts & runs great. I can floor it from a stop or anything under 10 mph & it does great. As soon as you get to second gear & floor it, it backfires & sometimes wants to cut off. I’m testing at 30 mph.
Tried a second new carb, capped off vacuum advance & have had total timing anywhere from 28° to 38° with no change
Tried a second new carb, capped off vacuum advance & have had total timing anywhere from 28° to 38° with no change
