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You could perform an abbreviated version of a
leak down test.
Get #3 to TDC on the compression stroke, then with your air compressor and the proper fitting, charge that cylinder with compressed air...maybe 30-40 PSI.
Listen for where the air is leaking out (exhaust pipe, carb, oil filler tube) and look for bubbles in radiator. That should tell you what needs repair (exhaust valve, intake valve, rings, or head gasket).
Even if you are not in a club, you can contact one and there are probably folks there that would help.