So Im looking at finally getting back into swapping the 307 out for the 5.3 but looking at the factory wiring what do I need to keep? The factory harness is a nightmare.
Well, that's a pretty vague-assed question...... What are you doing for gauges? Are you keeping AC? What constitutes a nighmare (worse than a carbed 5.3 in a Cutlass)? What trans are you going to run?
The basics you need to keep are the 3 heavy gauge wires to the ignition switch (red, pink, and purple) aside from the front lights and horn harness.
No, 3 harnesses: ignition and gauges, computer, and lights and horn. 4 if you count cruise control...
I have to ask: why carb an LS?
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