It just seems to miss and sputter around 3500-4000rpms. Pulls pretty good up to that point. I need to get the manifold taken care of and re-verify the timing, then see whats up. It could be the vaccuum advance also. I need to check that too. And of course the engine has a modified intake manifold and it's possible I have the vaccuum line for the advance hooked up wrong. I'll have to switch that and see if that helps.