My experience with my 92 dually in the sig.
The 92 had a totally blown engine (not head gaskets) from way over heating. It was turboed (Banks Sidewinder). Coolant came out of the turbo when I 1st tried to start it, (I could have killed the dealer in SC for lying).
I bought an 88 engine with only 78K miles on it (truck was used for maintenance on a Hospital Campus only).
Stuck it in the 92 and put the turbo on it. So far no problems with it. I can tromp on it from standing still, within a hundred feet, boost reads 15 PSI. The US Gear U/O is stuck in Overdrive.
No black smoking, still haven't turned the IP up. Original GP's, original IP, original injectors, original return lines and no leaks. Tires 235/75/16R.
New paint job uped the horsepower to 250.