danman, I think I've got some good news for you.
A little research on the web led me to the below pic of an original style driver side alternator mount setup (alternator not installed) that shows the brackets you need to use the front of your rams horn mounting holes. You will need both the upper and lower brackets, plus the long bolt that runs through the bottom of the alternator that is sandwiched between the lower mount upper hole and upper manifold hole. Plus some spacers (to align the alternator pulley with your other pulleys), washers and other hardware to secure everything in place of course.
You can currently find an NOS lower bracket
HERE for a fairly decent price.
A reproduction upper support bracket can be found
HERE, also for a not terrible price.
Hope this provides you a "headache relief" moment and you can get yourself moving on with the project.
