Sure, anything can be saved. A good frame machine could maybe pull it back, or a donor car to cut a good piece out of and replace the damaged section. The real question is whether you want to spend the time and money doing it, it isn't cheap either way. If you can do it yourself it would cost less, but still not real cheap. IMO if it is a real Boss and the rest of the body is in good shape it would be worth doing.... But I'm a bit nutso on old Mustangs anyhow!!!!!