Very nice find. I have a 1978 NYer Brougham that I have been working on for several years if you have any questions. My major project was to replaced the Lean Burn system with an Edelbrock carb and an electronic ignition.
As for the power windows, other than an electrical issue, it may be the grease in the window motors is preventing movement. Look on this site for instructions - comments on how to remove the power window motors and replace the lubricant - grease in the motor / gear housing. I had to do that for all four of my windows and replace the plastic gear in one of them.
If you need assistance with with the windshield wiper plastic cam to a metal fabricated fix, I posted a thread awhile ago with instructions.
Just around the corner from you here in IL.
Steve