No idea to be honest. That project is annoyingly halted right now for a couple of reasons...
messing around with the IP is actually way down on the list of stuff for me to do. I'm going to get it running well on all the boost it'll make first, then probably modify the stock IP first, run it a few thousand miles, pull it all apart, check for any wierd wear patterns, and if all is good, then start messing with the IP.
As for what can fit...I'm pretty sure almost any not very modern IDI IP pump will work if it's for a six originally.
Oh, and next time I see you online, I'm going to hit you up about turbo selection for the 104s, since Matt has shown me the error of my N/A ways
Actually, come to think of it, by the time I get to that point with the LD, I almost might as well start on a MB diesel swap.....hmmmmmm