IF that thing only has 60,000 on the clock and hasn't turned over, it's very possible that the valve stems are the problem. It's a pain in the a$$ to change them with the heads on, but if you're patient, and keep thinking to yourself how much more work it is to pull the heads, it isn't that bad. You need an air compressor to hold the valves up, a compression gauge fitting or other lashup to get air into the cylinder, and some means to break the keepers loose. Many guys stuff rope into the plug hole to "pad" the valves from the piston. There are a couple of different compressors you can use. Mine was the hand twist deal that KD used to sell, there are others. It would be worth a try before you tear it clear down.