I got the rear U joint disassembled yesterday. I had to use a wrench and hammer combo to bang out one side. Literally took probably 100 hits or more. But then I could just press out the other side. Unfortunately the U joint is a bit messed up as shown in the photo. Not sure if this is from the effort it took to remove it or if it happened on the road 30+ years ago (note the metal shavings that collected in the center, so I am thinking the latter). It still spins over okay so I just repacked it and stuck it back in, but I plan to replace it before too long.
I tested the tolerance on all the main bearings except #5 and they were all 1.9-2.2 thou. I removed all the pistons; the #2 cylinder looks a bit “ruff” so I think I want to hone them and install new rings. In the meantime I can de-gunk the pistons.