With that many miles, I would just go through the whole thing. Change the chain and/or tensioners if they need it. You might also want to take a close look at the rings, pistons and cylinders. The valves can throw the compression off, but the wet difference says the rings may be worn.
I suggest that you don't unbolt the rod ends. You can test the bearings by gently shaking and twisting the rods. They should not do either of that much. If you remove the bolts, you have to buy 4 new sets to replace them with. New bearings are about $10 each half ($20 a pair). I personally use plastigage and only replace bearings that need it.
Do you have a good way to hold the engine while you work on it? Here is what I used....
http://www.ninjette.org/forums/pictu...ictureid=10635