Another thing-if you're willing to settle for a rotary pump, look for chevy stepvans on ebay. One not too far from me sold for about $1800 recently. That was THE WHOLE RUNNING TRUCK, including the diesel spec chevy turbo 400 trans and the adapter between the engine and trans. Just that adapter sometimes sells for $400 complete.
Who knows, you might even get lucky and find one new enough to have a p pump. From what I can see, the 4bt's switched to the p pump at about the same time as the 5.9's did.
'98 12v 2wd dually, SB DD, Detroit locker, 64/65/13 htb2, CPP 7x10's, 3kgsk, bhaf, 19*, 50 lbs boost