Unfortunately we don't have a very strong Ford following here. I would like to change that but I'm only one guy...
Anyway, you will need to carefully go through the wiring. The wiper stuff, brake stuff headlamp stuff ect has to stay including the relays. The fuel pump will run a 5.0L MPI but cannot for a carb. Are you carbing the 5.0L or are you transfering the injection harness ect? I have nothing first hand for you. I've never owned a BII.