Here is a calculator for the guys running nitrous. I called nos and the jets they say to use are the same as the calculator comes up with. It also shows what hp your getting to the tires.
http://www.robietherobot.com/NitrousJetCalculator.htm
01 4WD 6.0HD- NELSON custom tune/ 224/224-578/578 112lsa synergy motorsports cam / asm's, 3'' to x-pipe, to y-pipe, 4'' top ten flowmaster / smi 9 1/2'' 3500 stall/ smi 4l80e/ intake/ ported t-body (nitrous system) cheater solenoids, 2 fogger nozzles , holley blue pump, regulator and 1 gallon cell