198 compression question

cam or valve adjustment could be a problem here, I don't know what year model eng you have, plus if the /6 sat and he had thin/burnt oil on it the exhaust system may be contaminated with oil... set valves and do what
the poster before me said and drive it and see if this clears up if the rings are not
toasted, valve seals and guides could be sucking oil in from the top to the piston.