Got it - no rebuild now, just get it turning. Then see if the valves go up and down too.
The piston that's moving a little could be free. Leave oil in there.
Perhaps a more effective penetrant than oil for the other three? A long time favorite of mine is a 50/50 mix of kerosene and ATF. PB Blaster is also good.
How's access to the engine? Remove/reinstall may not be that big a deal. Could be as little as 3-4 hours for removal, 3-4 hrs for reinstall.
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