Here's what I found when I lifted the valve cover. Changing the plugs and gasket tonight. The plug wires appear to be in almost brand new condition so I'm going to try some electrical parts cleaner/degreaser on them first. If that doesn't work I'll replace them. I really appreciate everyone's feedback. All four of the plug cylinders were in nearly the same condition as shown in the pics. No evidence of any cracking in the valve cover after a cursory inspection. Gonna run it through the parts cleaner this evening and inspect it more carefully.
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