So...it looks like I found a simple exact fit H.O. alternator through good ol Mike Singer.

"Hello John
The upgraded unit that I offer for your vehicle is a 180A (210A peak/ 130A idle)-suitable for up to 3K RMS daily-. This alternator is a direct bolt on design for your vehicle and would plug in just like the factory alternator (includes overdrive pulley for proper idle performance at low rpm).
The total price on this unit shipped w/ my lifetime warranty on labor is $439."

not the best price in the world...but the peace of mind of proper fit and simplicity of install more than make up for it!
...and 130 at idle sure beats 80 at max! to be continued!