Since that is a OHV Twin Intek and when doing a compression test I set both intake valves at approx .010-,012 and re-test compression and compare one cylinder to the other. (make sure the ex valve lash is not too tight if you see the compression still low on either cylinder. Should be around .005.
What this does is take the camshaft ACR out of the loop. The ACR is for the intake valves on that engine.
I would expect both cylinders to be with 5-10 lbs of each other and close to 90 or more.
The previous owners description of what happened (a pop and stopped) and what you see is iffy?? (not quite adding up)
See if it's getting fuel to the carb or give it a little prime gas into the carb throat.
I've seen them engines at least try to run on even one cylinder and at 60 psi the plugs should have been really black/oily.
Before I loosed the valves for another compression test I would check for spark on each cylinder and then if spark give it a prime of fuel and crank to see if you get any promise of a pop/run.