Chuck,
I spoke with a MB mechanic today and he said that his only worry would be that the apparently since the crank and the flywheel seem to be balanced as a unit that by putting a different flywheel on an existing crank there might be some vibration.

He said that he had replaced the crank on a 450 once and when he ordered it from MB the crank came with a flywheel as a balanced unit. He said that mostly it would be a trial and error deal but that the conversion should work w/o too many problems.