rodriguez8279

I want to buy a 2004 gto wiring harness and ecu for my 5.3 build . I am swaping the intake with one from a 2000 ls1 camaro and fuel rails and injectors. I know i have to change out the water pump as well. But will that harness and ecu work on the 5.3 . I am new to all this and i am sorry if im going at this all wrong but i would very much appriciate it if someone can help me out here.