Like Turbolq4 said...5.3 with a Cam is wicked! Especially in our cars. And if you don’t have to worry about smog like I do, slap a turbo on it.Don't let the 6.0 bug kill the budget. A 5.3 with a cam and valve springs will wax a stock 6 liter for less money. Really, just slap a completely stock 4.8/5.3 in it to just get it on the road, I guarantee you'll be impressed with the power.