Sorry about the title ripoff 1BADC10

Well, this is my topic about the 5.3L swap I am doing on my project truck. The project truck is my 1980 GMC 3/4 ton 4x4, which currently has a TPI 350, SM465 3 speed standard with granny gear, and an NP205 transfercase. It started life as a 2wd 3/4 ton with a 350 / TH400 combo, with a lot of rust, and is slowly being worked towards being a nice tow rig for the summer My donor rig is a 2000 GMC 1/2 ton 4x4 with a 4l60e that was rolled 12 times last August.

I plan to run an NV4500 5 speed standard behind the 5.3L, and an NP241 passenger side drop transfercase. The 241 has a 40 tooth toner ring similar to the newer transfer cases, so the speed sensor shouldn't be a problem. My truck will have an electronic speedometer from a 90 - 91 truck, which should be compatable with the 4000 pulse per mile output signal from the ECM, factory tach with a signal doubling module I'll have to either buy or invent, a stock temp sending unit on the passenger side head, with a mechanical oil pressure gauge hooked up to the spare port that you can tap above the oil filter. Exhaust will be true duals, with out cats, so the rear two O2 sensors will be eliminated, and I plan to run F-body manifolds to avoid frame modifications. I am also planning on eliminating the EGR. I'm hoping to make this install as close to factory as possible, so I am hoping to run the stock air box, fuse block, ECM mount etc.

Now, for the questions! The engine harness seems pretty straight forward, basically leave it the way it is, but I need to get pinouts for the blue connector that goes between the engine harness and the cab harness, and if my assumption that the little 3 wire connector coming off the engine harness to the chassis harness is infact the fuel pump wires. More than anything, I'm hoping to figure out what all I can eliminate from the stock wiring, so I've got as clean of a setup as possible. I then plan to make a complete wiring guide out of what I learn for others to use in the future, so there isn't quite as much figuring to do when starting one of these swaps

Here are a few pics of my project truck, engine, and the donor truck: