AC was a rare option in 1965, especially in a low-end A-body. My 1965 Newport C-body didn't have factory AC, rather an after-market York compressor. I think the radiator shroud was only on AC cars. So, the setup was likely a quickie kludge rather than a careful design. My after-market system also has an idler pulley, which seems over-complicated. Might have been needed to get the wrap angle on the pulley and/or clear other components. It does make adjusting belt tension easy. My 1965 Dart also had an after-market system w/ Tecumseh compressor - York footprint but heavy cast-iron beast, and also an idler pulley.
