I also think you will be just fine. The 7.8 is a great little engine, that will work it's butt off all day, even in stock form. We have a fire truck that came with the 7.8 in it, scales somewhere around 32,000 i think. Engine does fine, pulls great and doesn't fall flat on it's face like the 3208 does on a hill. Now if it only had a jake.....
'99 F250 CC-SB 4x4, AFE Stage 2 intake with Pro-Guard 7, Dieselsite coolant filter, DiPricol Full gauges, AIC, On board air + Buell emergency series air horns, Striker turbo timer, Striker I module, Cyclops anti-theft module, TC lockup and 6.0 trans cooler. Powerslot Cryro'd rotors and Hawk LTS pads.