Thanks for your response.

From what I can tell, I have hardened seats. I also took the good #1 valve with lapping compound on the #4 seat to lightly clean it up to get a better look. Both cleaned up nicely and the seat looks to have an even pitch and no pits. I did a graphite test on the seat as described in the shop manual and got a nice even line on the contact surfaces. The local machine shop wants me to pull the engine if I bring it in. I think I'd just rather lap with new valves, check for even contact and make a decision based on how they look. It seems to me I'm out the personal time of removing and refitting the head and gasket materials if I test my hunch, vs. the hours of time and bother to pull the engine and refit it. I'd also need a lot of additional resources to pull the engine at this point. Just a thought.

Thanks again and for recommending a guide driver.