I’m just finishing up installing a Ron Francis kit in my 60 short stepside. Previously I ran the rear harness down the driver side door jamb, covered up by the rocker sill and exiting at the rear corner of the cab, same as stock. Over time I found this to be miserable and tedious.
This time all the headlight, hood, and rear wires are going out a firewall hole to the driver’s side of the power brake booster. I’m running the rear wires straight down to the frame and along or inside the frame where it’s boxed. For me this is much easier to route and access later if there is ever a need.