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To be honest, every time i need a wiring diagram i go to American Autowire and look at their kit instructions. Most colors are same as factory and can figure it out from there.
What each wire is for. This was a non SS car that got turned into a race car and now a L99 swap. I found SS diagrams and they only show like 6 wires on the engine side harness but this car has about 5 extra wires in the bundle.