As title says

I have an 86 M1028 (basic k30 Chevy) & want to convert to gas.
I bought a low mileage 97 Chevy 3/4 ton 2wd & plan to install
vortec 350/4l80 into the 86.

Im looking for recommendations or tips on the wiring part of it.
What's the best way to combine the 2 ?
Mod factory 97 harness ? Go with custom harness ? Other ?


Thanks in advance.