Shouldn't be too hard to find parts I imagine, isn't the diesel engine in that truck the exact same diesel engine found in all the Silverado 2500's of that era as well?
That would be sick, dude, because they are pretty rare. I know I have seen a real real real lot of 1995 - 1999 Tahoes on the road, and I have STILL never seen a diesel model (unless I did but never heard the engine as it rumbled by). That would be sick, plus you can get gobs and gobs of stump pulling grunt out of a diesel if it's turbo charged. You can boost the pressure and add a tune and the thing gets nasty power. This guy at my work had a 1996 Silverado 2500 turbo diesel and he upped the boost and turned the chip + custom 4" straight pipe out the back and he was pushing like 600 ft/lbs. (this is what he said it was putting out, but I took his word for it). That thing was loud and sounded awesome.