LS Wiring harnesses questions

[softballnrd27]

I want to buy a wiring harness to start modding it myself, what year should I look for? I plan on swapping in a LQ4/9 with drive by cable TB(swap to DBC if it is DBW) with a th350 behind it. What years are best for this and if I get a good deal on a DBW harness can it easily be modded to DBC? Does it have to be from a 6.0l truck or will a 5.3 harness work? I won't have the money to buy the motor until Nov/Dec and I want to start gathering all the smaller parts to make the swap easier once I get the motor.