Nice one Bob.

Let me save you some trouble, there's not much you can really do to dramatically increase the horsepower on these trucks without going FI. The only company to make a supercharger stopped producing them years ago. You could do a turbo but you'd have to run all the piping yourself. That leaves you with breathing mods (aftermarket intake and/or exhaust) but those probably won't give you more than 20 HP total.

As someone once posted in a sports car forum I used to belong to, if you want dramatically more horsepower just buy a faster car.