I know, there's a million things...

It's a pretty basic 9:1, iron headed 440 with a mild cam. The distributor is a brand new Summit one. I replaced it because I thought the timing was jumping around at idle, but it was just my dial-back timing light making it look that way. It made no difference to the idle

I could try idling it down a little and see if that helps, but it seems like the type of problem that shouldn't happen whether its idling at 900 or 700 (but who knows). Maybe too much transfer slot exposed?

I guess just adjusting the idle down a little is easy enough to try.

Thanks for the help.

Greg