Appreciate all the help. Cffisher, I too thought vac of trans, plugged the line at the manifold and its fine, also climbed under to check. Still think it might be vac and not ruling it out. I Still think I could have back popped badly out the carb and done some internal damage, maybe even a vac leak there. Going to go all around the manifold and carb with a propane torch (not lit of course) as if there is a leak, the propane will smooth out the idle instantly. Crowbie, if teeth on timing chain, woulnd't timing be off? I checked it right when problem occured and it was right where I generally have it set. Generally there would be some noise there. The old screwdriver handle to the ear check says it sounds pretty good in there. Not sure I wana rip it out yet.
Gonna check compression over the weekend to rule that out. Still thinking that GM HEI coil went bad. Although it was pretty new, 2000miles, I know these things crap out and leak at higher rpms. Also, my cap is really close to firewall as you chevy guys may know. Under harder torque, I suppose it could hit. Going to buy a new one for kicks. Any other ideas are appreciated. One final thought on vaccuum, if I pull the PCV valve and hold my thumb over it, should I feel vac there? Because there is plenty. Thanks to all...