Here are two compressor mountings, one with the set up Jerry described and the other a single belt system. The brackets for driving the alternator off the compressor are available from several sources. The single belt has worked on my Buick for over 30 years. Around here many Model A's have a/c and if an 40hp engine can handle one I would think an 80hp one could.

[img]https://i.postimg.cc/YGZS0k5Y/IMG-4166.jpg[/img]

[img]https://i.postimg.cc/0b3h4jpp/Straight-8-a-c-mount-001.jpg[/img]

[img]https://i.postimg.cc/XXt8SCz7/Straight-8-a-c-mount-002.jpg[/img]


Evan