[biketopia]

Slosh tubs makes a set of cowl panels to smooth and delete the heater box area. Then with the LS, like said GenIII 5.3 or 6.0 and with a turbo, unless you're going for all out power which with 7-10psi I don't think you are, a 5.3 will do you just fine. Then your choice of using the donor trucks wiring and computer or picking up one of the trick holly terminator systems that has everything included and from what I've seen a fairly straight forward tuning suite with good support as well.