I have the same setup you do, I didn't charge it yet, but mine has held vacuum since November so I don't expect problems so long as the compressor can build pressure
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I did drive the car with the belts setup this way and they seem fine -> I didn't turn a ton of RPM yet but it made a 20 mile drive. I didn't have to shim anything, but I did spend a lot of time making the 4th mount for the compressor and remaking some things around it. I also had to make a bracket for the water valve, an extra one for the under dash box, completely different vents, a 3D printed tube to get the vent hose to the driver's side, extended all the wiring, and modify the glovebox, but we're basically there.
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Classic auto air install 1970 Duster with 340 and Edebrock Super Victor EFI Manifold