If your interested, I have a full 5.3 truck harness, Vortec IM, injectors and fuel rail for sale. If you dont already have an engine, you can find hunders of them on car-parts.com
I got my 5.3 through them and its been great. Came with a 3 month warrsnty to so I know I had a good engine.
5.3 swap, ported TB.