Painless wiring???
I've got a Ron Francis unit I'm getting ready to install in my '63 Belvedere. I've just cut every wire out of the car and should start installing the new harness next week.
I'm also closing off all of the holes in the firewall, and running the wires under the drivers side front fender to keep the engine bay clean. Yes, it could make tracing wires a little more challenging, but once my wiring is in I doubt I'll have to mess with it later.
I like the 'kits' are organized, and, though someone mentioned numbering versus textual ID of the wires (which I think is a good idea too), it does simplify installation for the electrical novice in lieu of a full blown schematic to work from/create.
Southernman