wire harness
Use the small harness in the coil driver kit and nothing more. Cut the mustang harness down to basic engine and gauge functions
Find a pinout of all the body connectors for the mustang harness. ID all the gauge, power, and interior fuse pins then pull each out of the harness individually. Once those are separate you have successfully separated the carb harness from the EFI harness. Everything you need for the swap should be there
Here is a wiring diagram I drew out for everything firewall forward.

Here is all the wires that go out to the engine bay:

Here are the wires that go to the back of the car for fuel gauge, lights and what not:

I don't have a clear pic of behind the dash, but I've still got to add a fuse block bc I've cut it down to about 5-7 circuits.






