Which size drums on 69 Dart? And some other brake questions.

Now's the time! you don't want to bleed the brakes multiple times. Do the whole front system - wheel cylinders, hoses, springs under tension. You should at least consider the Master cylinder since there has been contaminated fluid sitting in it for so long. I'd do at least the front lines - heck do all the lines. This is the one system in the car that you really can't afford to have fail.