Well don’t get too down until you got solid data...
I needed a 235 temporary replacement for my original 216, the best candidate in my junk car pile was an engine that last ran in 1980,
After removing a gallon of cherry pits and mice nests, from inside, I gas washed the rockers and valves and oil pan, sprayed oil on it, hammered all the valves free with wd-40, pounded some bent push rods straight-er...
And that’s the engine I’ve been running for about 3 summers now. It leaks coolant out the side of the casting a bit, this engine also froze a bit with water in it one fall back in the late 70s, I’m gonna use jbweld to seal that up one of these days.
-s