I used the '82 harness that was available in my '85 K10, the main difference, if I remember correctly, is a oil pressure switch that powers the electric choke. I had to open the loom and leave the oil pressure switch connection reach down farther because I used on on the block near the filter not at the distributor. The harness only included the engine sensors, HEI connection, choke, fuel tank gauge and starter wires. It also ran the starter wires down the front of the engine where as most of the TBI's I am a little more familiar with run them in the back.
The ESC and cruise control, I believe are separate harnesses and not available aftermarket.
The board has wiring diagrams that should verify the minor differences