How much power does the motor make, and at what rpm? Are you planning on using the GV overdrive (if so what is the ratio) or just running through 3rd gear?
Before I say what it makes let me say I dyno'd the ORIGINAL combo. This one should make a tad more. Original combo made 467hp@5600 and 514Ft/lbs@3900. So add a little more to that and I should be in the neighborhood of 500hp.