Thats cool, Ive been thinking of doing this for a couple years, I was figuring on getting around 30 mpg. I know a 6.2 or 6.5 would fit (as long as it doesnt have A/C) but my problem is that I live in the conntry and I drive alot of dirt roads and Iam sure the front suspension wouldnt live with all that pounding and the wieght on the front end, so I scraped the Idea
-96 6.5TD K3500 Crew Cab Dually 4x4, 97 cooling mods, Dmax fan, 3.5" downpipe, 4.5" straight exhaust, intercooler, custom intake plenum, fast idle switch, Ranch Hand bumpers, Turbo Master, egt, boost, & trans gauges, 6" Superlift, K&N off the turbo.
-88 6.2 3/4 burban 255K
-83 6.2 CC C30 220K
-82 6.2 1/2 4x4 burban 270K