Still working on it, but I'm driving it now, so I'm more in-tune with the car.

I've established a few ideas-

Engine is good; when not smoking it passes local Memphis emissions test -
Yesterday @ the inspection station, vehicle was well below CO and hydrocarbon limits.

After driving 30 minutes, smoke begins, along with a slight misfire accross the board (all cylinders), then oil (or contaminate is burned off and engine runs perfectly again).

Keep in mind, I took both heads off, had them machined, replaced all 48 valve stem seals and every gasket on the top end. Also new plugs, wires, and distributors.

When the car is in a smoking fit, it emits whitish , steamyish smoke that rolls like fog. Smoke is not sweet like antifreeze and coolant level has not changed, car doesn't overheat.

I noticed a wet residue running through the crankcase vent tube @ the left (passenger) valve cover when the car was smoking.

A tech @ the local dealer suggested the check valve on the oil pump being bad and the pressure being too high?

Car has had new throttle actuators and was serviced @ plaza, though the shop forman didn't remember the car and wouldn't help me with any clues...