Why did you unhook your vacuum advance? I thought that only came into play at cruising speeds.

Mine idles fine at 800 rpm. It's real smooth off idle and is relatively crisp throttle response at lower rpms. Seems a litttle gutless as I get up to speed, but my last car was a Dart with a built 440, solid lifter cam. Probably a big difference from this 440 in a heavy B body....