There is a guy in IL (trying to remember his name) that pulls a P-pump 7.3 in the 3.0 class. He sells a kit to do the coversion. Was pricey last I heard, but doable. Course you can talk to BDP or Full Force as they seem to have plenty of fuel with their sticks.
But listen to the advice of others. Not saying it cannot be done, it has been, but it is a long road to travel.
If you are real serious, shoot me a PM. I am borderline ready to toss in the towel on mine for street driving and go a different route. Would be perfect foundation for pulling only setup. Lots of spare parts that I could package up as well (1 extra complete motor, 1 extra block and crank).