For the kinds of parts your looking for get a Firebird cataloge from Classic Industries, Ames, Year One or a similar supplier. They have between them pretty much what ever you will need as far as disc brake kits, seat belts, bushings, rubbers, etc. Power windows and locks are kind of a big item to find. Might be easier to train your girl to do the locks and windows for you. If you pull your door panels and grease the window tracks, the windows will go up and down pretty easily. Personally, I roll the windows down in May and leave em down till September and don't bother locking the doors. Mild power can be added with a new recurved distributer, electronic ignition, 4 barrel and intake, headers and exhaust. You can also play with tire sizes and rear end gear ratios to get there a little quicker until you want to go internal on your motor. In the meantime enjoy your new ride.

Gerry