I took the 68 executive inspection car totally apart. It is definitely unique (to use a nice word). After I had it apart I thought 'Hey, youtube had a whole bunch of stuff for nuts and bolts repairs on a lot of the postwar engines and motorized units. Let me check there.' To my dismay I could not find one video of that unit being serviced. One guy had something about rebuilding the car shell, but that was it. I recleaned all the moving parts, added grease and oil appropriately, and rewired some stuff that had flaking insulation. I found there is a very specific order on putting the parts back together.
In the end, I put it on my test oval, and it run much quieter than before, and a lot faster. So overall it was successful. I am definitely not looking forward to any future servicing of that vehicle (I did replace the bulbs with LEDs).