I did a full brake system rebuild on my 66 Monaco wagon including switching to a dual master cylinder, if you have the time look at my long thread:
66 Monaco Wagon Preservation
I used some cut pieces of heater hose to shim between the line and the compressor body, see the photo. Hard to see but I had just enough room to take off the cap to check the fluid.
I did get the compressor hardline set from Nostalgic Air, it was part number SD1610. They make it two ways to work on the driver or passenger side depending on your installation and you have to specify, mine was obviously drivers side.
Sometimes a hit with a heavy rubber mallet as you pull upward will work. Worst case scenario, remove the front seat so you can push with both feet while a helper pulls upward.
I added a thermostatic switch with a capillary tube on the firewall near the expansion valve. PN 119-9920 from Nostalgic AC Parts. Shown in the parts photo below the compressor.
Sorry for your pain, vinyl tops were one of the dumbest options ever offered. Have you removed the window trim yet? Doing that may solidify the choice of repairs, I have a hunch it will be worse underneath.