I'm guessing the computer for the 91 Chevy 4.3 is part # 16144288?
This gearhead-efi link has good information for the 16144288 ECM:
http://www.gearhead-efi.com/Fuel-Inj...Information-AO
At a minimum the harness needs Battery +, Battery -, Ignition switch On / Start power, and the Fuel Pump Relay wires connected to work. The diagnostic OBD1 connector needs to be hooked up too.
Harnesses are always time vs. money. I often wonder how much time it would take to make a new harness vs. the time needed for fixing a used harness? Likely the cost to have the original harness fixed is possibly close to the cost of a new harness? Likely the original harness has visible issues (broken connectors, frayed or brittle wiring) or possibly hidden issues that will be the source of a future problem or the source of immediate frustration?
If there is sufficient budget, I highly recommend a new harness.
https://www.speedwaymotors.com/Speed...ess,46375.html
I think in the long run, converting to the 1227747 ECM is a very good option. The 1227747 has an enormous amount of aftermarket support. The 16144288 has very little aftermarket support.
Gearhead-efi link to 1227747 ECM information:
http://www.gearhead-efi.com/Fuel-Inj...Information-42
The 1227747 was used on TBI 4.3, 5.0, 5.7, and 7.4 liter engines. Basically the wiring is the same for all engines, but the CHIP is different for each engine.
dave w
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