My guess is they couldnt find a weighted one for a magnum engine so they put a LA fly wheel in it which caused the vibration! I would consider it evenly grinding. Havent tried to run it yet. Looks like it would clear it running but didnt feel like gacking parts and before I did anything and ask...
Hey there just recently acquired a 72 Demon with a 360 magnum and A833. Had a neutral balance fly wheel and put a new 360 magnum weighted fly wheel on it and everything went back together fine. But now the starter grinds when attempting to start. Made two small spacers and still grinds hard...