Wiring harness preferences
For aftermarket wiring harnesses, I highly recommend Enos Custom Components (San Luis Obispo, CA), especially if your vehicle's wiring requirements deviates largely from stock. I used them when it came time to rewire our "Blazord" ('55 F100 cab & bed on a '73 Blazer chassis), and couldn't have been happier with the results. Rather than receiving a complete, plug & play harness however, their custom hatness consists of individual wiring packages for each of the electrical systems used, (A/C, Horn, etc.), custom tailored to my specific application by wire color, length and gauge. The important colors all matched standard GM color conventions, and every 4 inches the specific application for that wire was printed on the insulation. Now I know some of you are probably saying "big deal, Painless does that too". Well Painless wishes they did it as well as Enos. My brother in law just ordered a Painless harness for his '68 Camaro and yes they do have the wire app. printed every few inches on the insulation, but between the text color, size and font type, some of them were honestly illegible. Enos uses big letters, an easy to read font, and text color that strongly contrasts with the insulation color. No problem reading their wires.
Also included in each of these wiring mini packages are hook up instructions for that application. There are also main installation instructions that outline the specific component hook up sequence, and it is all very easy to understand.
So you obviously spend a little more time running each wire & doing the terminations but the results (IMO) are far superior than an "One size fits all" harness. If you like to do wiring, it's a great way to go.
Daren