Plug color looks very good.
Gaps look excessive.
Compression numbers look good also. If you think they are high the contributor to that is oil on the walls. No worries there unless she’s blowing blue.
With the age of these rigs it’s more than likely valve seals.
Baseline the s*** out of it imop.
That’s what I did when I bought mine with 280,000 miles on it and 15,000 miles later it’s still working fantastic
You can look at my thread “it has begun again” and see the process I did.
Finally started the baseline process. Winter is here and all the ice and salt requires she not go outside! She has 285,000 miles on her and I bought her last March in Stockton Cali. Yesterday I stripped down the front axle. I have the knuckle kit but it turns out both birds require replacement...
forum.ih8mud.com
Cheers