Nuetral safety is on the shifter arm. 4 wires. 2 have continuity in park and nuetral, those are the nuetral safety. The other 2 wires have continuity in reverse. Those are for the reverse lights.
The vacuum module gets full manifold vacuum. Any full vacuum port will do. Carb, carb spacer, intake runnier, they all will work.
Forward trans cooler line is fluid out
Rearward trans cooler line is fluid in.