Can anyone help me on wiring

Put a 06 6 liter and 4l80 in my 01 that had 4.3 4l60 in it
took all engine wiring harness and computer from 06 but now i need to know how to wire it to the factory 01 fuse box and underneath plugs
wanting to make it as stock as possible

Also what would it take to put the cruise out of the 06 into the 01

 

You need a 99-02 V8 harness. The 99-02 harnesses are different than the 03+ V8 harness. It will be easier to use a cable throttle body and return fuel rails with the fuel pressure regulator. Does the truck have two fuel lines one supply and a return? You'll need to modify the trans connector if the 99-02 harness comes out of a 4L80e truck.