With the compression, he didn't have the cylinders wet, or it wasn't hot. His gauge looked old to. I might get it warm started and then check the compression again with gas in it. We checked the compression first, then pumped some gas and started it, it did take a min to start, but I just needs to be run like all old motors! With 75lb EXACT on each cylinder im going to assume that its either a busted gauge or line that leaks or something, or the headgasket is busted. By the looks of the outside part of the gasket, it is dry cracking and rotted. But I hope I can get 100lbs warm with gas in her. Il keep you all posted. How would it run if it only had 75lbs on each ---> would it just have less power??