Your windows sound like they need the channels cleaned and lubed. The old grease dries up and make them hard to go up. Also the rear qtrs are bad to have the rollers break. If you mess with the rear qtrs be careful they break easy (ask me how I know). Congrats on the car.
Restoring a 1968 400 4spd, numbers matching Firebird Coupe, Verdoro Green. Larry My old 68. Wish I had her back.