What a beautiful car!!
When you convert to disc brakes and dual reservoir master cylinder there will be challenges that present themselves with interference between the dual master and the autopilot servo and mounting bracket.
I have done the conversion on my 66 Town and Country and I know how to make it work. There is a specific master cylinder required which has the front and rear line ports on the engine side (a must for this conversion) and some modifications to one bracket and the gas pedal to autopilot servo control rod.
I would be happy to give you all that information and parts lists and some instructions and photos.
Check out this link for a discussion about the disc brake conversion:
65 Fury disc brake conversion advice
Further to your car - does your autopilot work? Generally the dash dial fails and the other issue that crops up is the point sets inside the servo need servicing. I offer a rebuild service for the dash dial and a servo point set service which I advertise in the WPC Club newsletter. 10 years and no warranty claims!!
Once again you have a beautiful car!!