Thanks for the replies. I did have it bored .030" and honed, and hand filed the rings. I bought new heads fully assembled, but didn't check the seals. I assumed they were correct. It seems like it must be leaking while running, as there is never any oil under it after it sits, but I don't see any oil on the underbody anywhere. I'll look into the valve guide seals, and watch it for a while yet. Thanks again.
'91 190E 2.3