idle problem with long duration cam

Also don't forget to check some of the fast ramp cams made for mopars. Comp, Crane, and I think Hughes (?) have cams that take advantage of the large diameter lifters. I have a wicked dirt track custom grind from Comp and it pulls HARD. As for the vacuum advance... Get an advance can that is adjustable and work it from there. The other thing to check in your timing is that the mechanical advance isn't starting to tip in at your higher idle speed, that can screw up drivability also.

Revhendo.