I have a 3.73 gear,a eaton diff.dynatech longtubes with cats and a gibson muffler set up,and i am going to buy a 5.3 with all aceesories from a buddy of mine,i know i need the ac lines,power steering lines and mounts from a 5.3 truck,i am doing a swap from a 4.3 v6 to a 5.3 v8 what all do i need to put this motor in and install it,and who sells a wiring harnees and computer for an 03 gmc sierra,automatic