la 360 aftermarket/remanufacture tag i.d.

The vibration damper would be a better sign. If it is perfectly round and the same width all around may be a forged crank. Since the motor was rebuilt no real telling till you actually look at the crank because may have been internally balanced. Although it is costly with a cast crank because of the mallory metal needed to balance it. You didn't show the flex plate which may have offset weight built into.