Single Wire Alt setup to 65 Barracuda Harness

Ok so last weekend I scored a fresh magnum 5.9 out of a 1999 durango. After going through it and building it to my needs. I plan on dropping it into my 65 barracuda as the 318 lump in it now is not stock. I also have plans to mount a Whipple setup I have been holding onto, which means I will be retaining the serpentine belt as well as the Alternator.
My question is how do I go about splicing it in to the harness with out Hacking it!
I know most single wire alts you simply run the hot+ charge wire to the hot+ side of the starter.
What do I have to do to the harness to make it work.

Also I have ordered (with the understanding it may take the better part of a year to get)
A new under dash, and Motor / frontend harness from "yearone" h&m or M&H what ever..

Any and all help is much appreciated
thnaks
j