[jmuck]

The 5.3 will definately have enough hp. If your engine is drive by wire and you want to change it to cable you can just swap out your throttle body or change the peddle to make it a dbw. The only concern you want to check into is the 700r4 b/c I had one attached to my 5.3 and never could get it to shift right. The tranny man said it never would. There isn't a spot for the dt cable and I fabricated one but it never shifted like a 4l60. After I put in the 4l60 mine shifts like a new truck and and gets over 20mpg. The 5.3 is definately the way to go.