I bought a Ford Wonder Bread van today with 60k on a 4bt, but it has manual steering! I am not exactly sure where the pump is supposed to mount. Behind the timing cover I assume. What all is required to install a pump? Different timing covers?
To my knowledge (and I may be wrong here, anyone wanna step in and correct me, please do so..) all of the automotive use engine timing covers have provision for the gear-drive accessories below the Injection Pump. Look below your IP and see if there's not a cover w/ 2 bolts. That's where a gear-drive pump would go. I've also seen where PS pumps are mounted above the IP, attached to the intake manifold (also some AC compressors go there, too).
The easiest to find is likely going to be the vacuum pump / PS Pump combo off a Dodge, but if you look around you may find just the PS pump. The one I have is on a P30, and it's gear driven w/ the two returns for Hydroboost.
Check the General Classifieds here:
http://www.4btswaps.com/forum/forumdisplay.php?f=6 or maybe post there with a Want To Buy, and you might give flEaBay a try, too.
Also, if you've got a medium / big truck junkyard nearby, I think they had PS pumps on the Freightliner FL-70 (or similar) trucks, and don't overlook buses / other trucks that used the B series Cummins.