So the Bronco in the picture looks like a 69. I'm guessing because it doesn't have marker lights, but it does have the 68+ parking lights.
That means that the original fuse box was mounted to the firewall near the throttle, and there are two square holes punched in the firewall for the bulkhead connectors. It also means that there are zero wiring holes in the passenger side firewall at the apron. Also, there is no wiring hole on the drivers side firewall at the apron (near the wiper washer grommet)
I am curious to see how you manage the firewall modifications. It drives me crazy when I get an already painted car...and then I have to weld up holes. Are you going to try to use the factory location for the pass thru...or will you drill holes in the firewall and put the fuse box in the glove box?
I would be very interested in buying the old harness when you are done. I need some 68-70 under dash harness connectors to repair mine.
Please post progress!