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Painless makes nice kits and there's a guy on 73-87 chevy forums that makes EXCELLENT harnesses for our trucks. Ill try and remember his name. I bought some power window relay harnesses from him. (Harnessworks)
I used the EZ Wiring harness on my 76 K10 and it went well, but I dont have anything to compare it to. One thing that I really liked was that each wire was labeled every 6".