1964 Dart Owner - In Over My Head

So I was driving by this sweet looking 1964 Dodge Dart everyday on my way to and from work that was for sale. Kept telling my wife how much I would love to own an awesome old classic like that.

One day she convinced me to stop and check it out. Next thing I know I'm now the owner of this car.

I'm an accountant by trade and never been very mechanical but I'm willing to do my best. The car is in really good shape and runs great. It's just got a few issues.

None of the gauges work except for the aftermarket tach and the alternator gauge. The tail lights only work as turn signals. I have no parking lights or brake lights. The right passenger window won't roll down. When I put two full size adults in the back seat, the oversized tires on the rear rub their sidewalls on the fenders.

I've got the service manual for the 64 dart and have started working on some of these issues.

Here's my question. I'm having a hard time finding sites that stock parts that are truly for such an old Dart. Any suggestions or tips are appreciated!