Bob, if you are not a purest the best idea is a "universal" prewired fuse box type harness. Pretty easy to install. I/we can help. Everything will have modern fuses. You will cut to lenght, route and crimp terminals on the component end of the harness wires. Not many circuits in most old trucks.
Example Good instructions and spare circuits. $205, Free ship. There is a 12 circuit also but don't see crimp terminal and other extras.
Good time to go 12V. Not expensive to do.
Speedway also now has the 12 Circuit with cloth covering to simulate old wiring. The price is $420!!!!! ALL of the so called original harnesses are faux cloth covered pvc insulated wire just like the universal harness has. Some vendors tell you that, some use mumbo jumbo to hide it.
Watch out using specialty small companies or "original harnesses". Too much hype, no value. Use a standard well known vendor. Even the big harness-only companies are more expensive and questionable value. They all use the same quality wire. No one has a "better" wire.
