Hennessey stuff sucks, I have the 6.2l motor with an AFE intake, SW long tube headers into a custom dual exhaust. Then 5 Star tuned the truck for me and what do you know I made more power than Hennessey at half the price.
There is no way on this planet 750hp to a raptor would be a good idea. The stock 6.2L already has enough power for t o beak trans/trasaxle. rearend and CV's prarts. The last last this drive train, w/35"tires, needs is more power. Ill save the supercharger for my Dinan M3