Here is the wiring diagram for the Duraspark Conversion. This one of the best and cheapest modifications you can do for your Bronco.
Key Points:
Use the Duraspark Ignition Module with the Blue Connector strip - ( This is located on the back of the Duraspark Unit )
The White Wire is not needed to connect.
The Red wire needs to be connected to a source that is Hot in Run and Start.
Connect the Green wire to the negative side of the distributer.