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Very interesting. I’ve seen lots of motors with similar damage to the flywheel and crankshaft keyways, caused by running a loose flywheel. But never have I seen such damage to the cam.
Whatever the cause, in my opinion, the flywheel and cam need to be replaced. And the shaft needs to be cleaned up shiny clean and inspected. The cam and key are no problem, there are lots of them around. I probably have a couple of them lying around myself. Flywheel might be a bit harder to find, but there were a couple of trainloads of those motors made and stuff is out there.
Cam is no problem to remove. Beat it off however you have to. Key is supposed to be tight, but will come out with a little persuasion.
This is important to avoid repeat damage–When you put it back together, make sure the shaft and flywheel tapers are clean and dry and use a torque wrench to tighten the nut to 45-45 foot pounds.