i've heard that you can use methanol/water injection.
i know in a naturally aspirated vehicle(car) you must retard the timing. I'm not sure about running it on a non turbo truck. but i would imagine it would work well with propane or nitrous. Snow Performance makes the meth/water injection kits. i've called them about a few diff. apps. and they were very helpful. i would call them and explore that option.

check these out
http://www.snowperformance.net/
http://www.intellidog.com/dieselmann/idi.htm