Been there, done that.
In my case, the head gasket had developed a leak. While the head was off, new valve stem seals were installed. I think it was April of 1989 that 103 motors got improved valve guides.
You could be looking at new guides and stem seals.
I was using a qt. every 1,000 or so. I changed oil about 1,200 miles back and have lost no oil - big improvement. My vehicle did not smoke before the surgery. It's nice to once again have a car that's fairly oil tight.