If the brake lines are rusted out, you are gonna need all new brake lines, wheel cylinders, and probably a master cylinder. Brake fluid pulls moisture out of the air, so if you have open lines, your gonna have rust everywhere in the whole brake system. When you get the brake drums off, check that none of the springs or clips that hold and return the brake shoes are broken or rusted out. This includes the brake backing plates(the round metal plate behind the brake shoes). I gotta feelin that you are gonna find major rust in the wheel cylinders and master cylinder and they are cheap enough that I would not even attempt to rebuild them. It sounds like you need a complete brake system. DO NOT SCRIMP ON THE BRAKES(not yellin atcha but stressin a point). Get the motor running first and the transmission shifting and then deal with the brakes. Just my opinion, Joe