1967 Dart Drivetrain swap.

well, you're gonna need to carry two spares for starters.

you'll need a custom built driveshaft most likely. depending on the trans it may or may not match the 904 yoke, and the carrier/u-joint for the van rear is gonna be different. (this is assuming the trans is a standard splined output unit, and not flange style)

radiator and shroud. the entry and exit for the coolant is in a different location for V8.

depending on what the motor came out of you may need a different oil pan and pick up.

i didn't see bell housing on the list.

the reverse light switch is on the transmission. i think you should be able to run from there and then just splice into the factory harness at the bulkhead. you may need the wiring diagram to figure out where to poke in at, or you could just trace the wires from the column.