Good question and relevant. Some of the tech notes contain dead links and some contain some suggestions that could stand another look today. That has been discussed, by the way.
I've done it this way...in parts, that is. Once on a 1951 GMC and also around that same time on an MGB. Process is the same, no matter how you slice it, but I should add one observation. This approach works best if you have a firewall socket/plug. That is to say wiring under the hood leads up to a socket and wiring behind the firewall (internal wiring) plugs into that socket, leaving a natural staged approach.
