Murray wanted to know how this came out, so here ya go.
3 wire 65a alternator to 1 wire 100a alternator.
Shiny new alternator in place. Used same bracket. New alternator came with a smaller wheel, so I had to go to a smaller belt. The voltage regulator is gone off the firewall too. The wires coming from it were dead-headed, except blue and blue/white, which were wired together. Don't know why, just what the wiring diagram tells me. The red ignition light near the key does not light any longer.
The single 6 ga cable coming from the new alternator goes to the hot side of the starter solenoid.
My year Superformance does not have fuse protection for the main wiring, so going up to 100amp would have fried the smaller gauge main wiring (possible fire). So I went to the local car stereo/Pimp My Ride shop and got an 80amp fuse. Installed it just downstream of the hot side of the starter solenoid. A good hidden accessible space for me was behind the glove box on the firewall.
Many many thanks to Blas, Dean and John for their input and help.
I really appreciate the help.