Copperhead,
I will mention a couple of things, then hope someone that actually knows something hops on board.
If you are actually indicating you would use a single wire alternator, the connection to the system would be pretty straightforward.
The part that might be a sticky-wicket would be if your '72 has a ammeter and/or idiot light.
For either of these to still function properly, the new SI alternator would have to have some connection to the old regulator wires.
Because I'm not familiar with your setup, I will stop here and wait for reinforcements.
Stuart
