So you need to find out more about this motor. What are the ring gaps, whos rings, who built the motor. I would not tear the motor down till you research who built the motor and then some history about the motor, someone has to know something. 38-44% leak down, I wonder if there is a ring or block problem or both and it was cause by the over heating of the motor. I have never run a motor that hot. Those idiot lights for oil pressure and temperature would of been a good thing to use and when the big red or blue light comes on see what was happening in the beginning.