But it would be very helpful if you knew the cam specs or compression. Just for future tuning.
Consider buying a $50 cordless endoscope. They are very handy. I have a Depstech one.
You might be able to look inside combustion chamber and read a piston part number or take a picture to see if anyone recognizes anything. Depending on intake, you could look down ports to see if heads were ported.
That’s all I really wanted from the owner was those thins all he could say was newly rebuild with 30 over pistons and ratings of around 400 hp I will say I can burn the tires off it if I wanted it puts back in the seat a little bit