Not Ranked
My suggestion,
Start from scratch! I have built electrical harnesses for a Toyota Supra Turbo running a Haltech engine management and for my Cobra.
I would approach this in a manner in such a way, that you make a harness on a bench with exactly what you need ( as far a circuits). Then with a few future options such as radio etc.
By using a prexisting harness you will never be sure if the problem is still there and with a new harness you will have less down time.
Also, use relays for ignition, starter, fuel pump, headlight, high beam etc.
Just my .02
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