Painting a repainted car?

Is that a Dart? You have a lot of work ahead of you. '67--'69 Darts are one of the worst, the long flat sides. I have one, actually two of them. Only one looks good, the one that's never been wrecked or had any metal replaced. I will never redo the bad one, I'm 71, I would be dead by the time I got it right! In the end, a good long John, primer and guide coat will be your friend. After you get it down to metal, put your DA away , it will only cause you trouble. (Orbital sander. )
Good luck