I have decided to keep the GM heads I have instead of buying new ones. I don't race the car, but want the feel when I take it out. My question is, what all should I have done to the heads? The engine is a 396 in a 68 Chevelle. It has stock crank and 10.25 pistons, Lunati cam (235 @.500, 525 lift, 2200-5500 range), Holley street dominator, Holley 750 vac, headers, 3in exhaust with Flowmasters, TH400, 12 bolt posi w/3.90 gears. I have been told a 3 angle valve job and new seals is all I need. It has new springs and roller tip rockers. After installing them it started blowing smoke at startup, plus all eight plugs were coated with oil, hence the need for head work. I assume the valve job is all I need. Should I put new valves in at the same time? Also, is the Holley manifold ok or should I go with something else. The cam seems to match the specs of the Edelbrock Performer RPM. Should I switch to the Performer RPM manifold? Any tips would be appreciated.