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if you only have 50-60psi compression its either your valves or your rings, or your head gasket, which would become apparent as soon as you remove the head. also, did you have the cylinder honed to cut the new rings into the bore?
if you can get a Leak down tester (loaner tool from an autoparts store) that has the correct thread for your spark plug, thats the best way to diagnose low compression. hook it up to an air compressor, air everything up with the piston at top dead center of the compression stroke so all valves are closed, and make sure the crank cant move (breaker bar and socket on the crank nut or similar) and listen for leaks. if you only have 50-60psi, you will hear the leak..... if its coming from the crankcase vent, rings.... intake, or exhaust, its one of those respective valves.
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