05stroker
Never enough power guy!
Theory 4 is it possible that the front pulley support you had made was/is out of balance with the crank and the harmonics took out the oil pump and the rest is history. The cranks I have seen usually sheer around a main journal not crack across the rod journal.
When we balance my crank it is checked with everything from the flexplate to the madrell that bolts on front of the IW balancer that is checked as well. The oil pump looks fine looking in from the outside.