IIRC the 72 duster will have a 2 field wire alternator.

One of those wires is key on 12v power. use that for your alternator. The other wire goes to the regulator.

As for the igntion box, I believe there is a diagram in the tech archives.

It's petty basic too. 4 of the wires get used. 1 is key on power, 2 are for the distributor pickup wires, and the 4th goes to the negative side of the coil.