Putting a new cam in my 360

Very worn at 100 miles. That's telling you a lot.

You got something in there during the cam swap. Either your buddy dropped his pocket change in there or something happened. I'd pull the cam. Check the journals. Check to see if you can find where the shavings came from. Until you know the source of the shavings, there's no point in doing anything else to it. It'll just burn the cam again, or worse.