Finished my Cummins to -90 2wd burban some time ago, now started to build another cummins with lightened crank and 24v head. The current version is 12v, ddp3's, hx40/16, 3000rpm, #10 plate. and alot of home made stuff. Go check my page, there's plenty of usefull stuff if you are going to swap cummins in a Chevy.
www.devilscastle.net
Cheers
Timo