[Walt Fricke]

Gib - are you saying raw oil was coming out the right side tailpipe? Or at least out of the single muffler outlet (which means you don't know which cylinder bank let it in)?

All our cars are like Harry's - they blow at least a small puff of smoke on startup now and then. Some or sometimes more than others. But that is just a bit of oil being combusted (Porsche once claimed - in the 959 owner's manual - this was water vapor, but I don't think anyone believes that.

In your case, given the car's history of just sitting around for so many years, I suppose raw oil could actually end up down in the exhaust piping, as at least one exhaust valve is always somewhat open. That doesn't mean your rings are shot. And oil, if high enough, can get past worn out exhaust valve stem seals, and down worn guides into the exhaust port.

I think your leakdowns are reasonable for the car's age, and the compression testing isn't a red flag either. Can we assume the leakage was all through the rings? Did you listen carefully?

Someone else will have to speak to how one removes residual oil to that level from the muffler. The header/collector part ought to clean itself up in fairly short order driving around.