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From your description and the shredded steel pieces stuck to the magnet it looks like the bearing spun and the motor was run like that for a little while.
The nonmagnetic lead babbit and copper bronze layers of the bearing shell are ground and worn off and the steel layer is shredded.
The crank is definately scored and it will probably be cheaper, take alot less time, and probably be more reliable to buy a good used motor and put it in.
You'll have to clean out all the oil lines, thermostat, oil cooler(s), and the oil tank too.
I hate it when that happens.
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