...you can also just weld up a mounting boss like I did and relocate the mounting tab yourself - just TIG in enough material, plane it flat, drill/countersink the hole, and yer good to go. While yer at it, I also highly recommend relocating the power steering pump - wait - are you running the GM pump or Mopar unit? Either way, can you completely remove the alternator without first removing the pwr steering pump pulley? If not, relocate the str pump mounts like I did and then you can service the alternator without doing anything to the pwr str pump.
To recap my mods, first the mounting boss to the upper water pump housing bolt -
Green - old, blue - new
Then, so get 'to' the lower alternator bolt, ya haveto relocate the pwr steer pump; from the first hash mark down diagonally to the second, and re-TIG -
...in order to access 'this' bolt, and therefore being able to remove the bolt, so you can remove the alternator without first removing the power steering pump/pulley, and you can still use the same serpentine belt. Otherwise this bolt is 'captured' behind the pulley...which results is lots n lots of swearing... 🤬 - I would save you that pain -