I've pulled the cylinder heads and the exhaust manifold. So far it doesn't look too bad. One cylinder has a small score that is just detectable if you run your fingernail over it and one head has the nicks mentioned before. Pistons and rings look good. Everything seems OK when I turn it over with the flywheel. Before I pulled the power head, I checked the compression it was between 120 and 125 all six cylinders.

Now I'll flip it over and open the crankcase to take a look.