When you're ready to make 700 lb ft of torque, and 400 HP, I know a good place, Bob's Perfomance in G'ville, they're a Banks Dealer, plus my pops is a mechanic there, so I know the work is good. And I imagine fairly resonable prices. Plus for $1500 It'd be as fast as teh Frankensuby
(Although the car was built for a different purpose.)
but on a more realistic approach, the banks stuff is really designed for towing, especially with an automatic, it can make a night and day difference.