Hi....Most likly the AC has been mounted in the back old fan space. Looks like a big lump up there. Get rid of it...faster the better. What I did on my 66 Caravel
was to pull that AC and use the spot for a Fantastic Fan. Then spaced correctly for fit I installed a Carrier Low profile 15000 AC. No longer made so I recommend a Mach 8 or Penguin low profile. You will have to run a drain line to the left side of the Caravel
and provide power too. By the way....the Fantastic and the AC are not overwhelming and you will love the options it provides. The fan can be a substitute for the leaky stove vent/fan right beside it.
"If it can't be reduced, reused, repaired, rebuilt, refurbished, refinished, resold, recycled or composted
then it should be restricted, redesigned or removed from production."