Got on it a little to hard over the weekend. Have a 283, 4bbl edlbrock. Heard a loud pop, then sounds and feels like Im runnin on 7cyls. No smoke, engine starts cold, hot etc. Will run, but not like before. Have spark at all 8, changed plugs last night. Pulled drivers side v. cover, all ok. Harder to get rt side off but I will if I have too. Does not appear to have any vac leaks. At the rear, it sounds like im runnin a radical cam. Like I said, its like Im runnin on 7. All help on what to check is appreciated! Thanks...Phil.