i have some experience with your dilemma...save time & money...buy a full tube chassis from Alston or Comp or any reputable chassis company...take a torch or plasma gun and perimeter cut the floor out of it...save only the sheet metal...no floors, rebuild all that on the new chassis...you & dad will end up with an extremly badass pro street falcon and have the time of your life building it...basically i'm saying save the skins, chunk the rest...build a new car with new stuff and dont even deal with the rust