I set the float setting lower so it is low to mid glass and now the bogging after accel is gone. I checked vac it idles at 13" I had to steal the vac advance line to check it though. Im thinking my plumbing of the pcv might be some of the problem. I just ran a hose from the back of the carb to a tee and to the booster and pcv off from it. could that cause a problem? any Idea what a 750 mech sec. speed demon runs for jets any way? I have a jet kit somewhere but should make sure I have what I need in it before im into the carb.......I have this habbit of needing the one jet size im missing.