Has anybody ever redone their own engine wiring harness. I was thinking of trying this. I have a 69 malibu w/350,no A/C. I have the old wiring harness, I was just thinking of updating the wiring with heavier guage. It really doesnt seem like it would be too much trouble. Better than $139.00. Any feedback would be appreciated. I have access to a lot of wires and terminals.