100 PSI is enough to show valves are not stuck open. See if you get vacuum when cranking it over (bouncing gauge needle). Some CEG'ers have found the rings lose compression if the engine gets dry of oil, or has a lot of gas flooding the pistons (like when it doesn't start). How did you time the cams? I know it's tricky, but not firsthand [maybe another CEGer could help here, that succeeded doing it.]
