Continuing to track down source of no voltage to coil while cranking
If you need a new connector at the transmission for the reverse and neutral safety, know that there are a couple of types.
The difference IIRC is the molded step. This is one style. (standard motor parts #S747)
edit: Kunkel on moparts had posted this pic showing the differnet flavors.
Connector above I think is the one one for a '68-77 switch. 2nd from right in photo below.
The one on the right is supposedly '78 up and gets a different connector.