440ci 75' T&C Engine

Yesterday I began to disassemble my 1975 Chrysler T&C engine. It was sitting about 20years in the junkyard with popped out freezeplugs. Had overheating problem without exhaust smoke. Standard bore and crank sizes in very good shape. Still had plastic gear timing chain which proofs the 60k miles odometer reading. Stock headgasket almost complete rotted away at water passages. Found some burnt exhaust valve with rusty spots on it, maybe crack in head which caused the overheating. We will see.