With a good tune your motor should be able to handle around 400 rear wheel hp. And make sure and get an FTVB or some sort of aftermarket valve body and a deep tranny pan for more cooling. Ill have some updated numbers on my truck soon so ill test the limits before you do most likely. But im really looking forward to seeing what the whipple does compared to the ati. Overall i dont think you've got to much to worry about. And a good tune will most deff be the thing that has to pull the whole combo together, i would recomend SCT, thats what i use.
Daily driver: 2001 Mustang Cobra- Eibach suspension, Tokico struts, Maximum motorsports full length subframes, 4.10 gears, MGW short throw shifter, JLT cold air intake, Bassani X-pipe, Bassani Catbak, full sound system
Project ride: 2000 Harley truck- Belltech 4/6 drop, custom 5 point rollcage, ATI procharged, custom built (billet) blower bracket, polished P1SC, custom built kooks longtubes, custom built 3in Xpipe, black MB motoring 22's, 42# fuel injectors, 90mm MAF, 255lph intank pump, 3.73 gears, built tranny w/ PI stall, full show sound system