what would it cost? 4 door '72 Valiant rust repair.

Funny, I am going through almost exact same scenario presently. Youngest boys first car was a '71 4 door Valiant we put together. Car sat for last couple years while he drove a Jeep. He wanted to start driving Valiant again, but I found a little RF frame rail issue, was now a big RF frame rail issue. We were kind of at a crossroads with car, when I decided to jump on Craigslist one day ( haven't been on that site for over a year) and up popped a '72 Scamp in the same color as the Valiant ! Car had been sitting awhile, somebody removed front end and bolted on some junk fenders and hood. We had all good parts from Valiant to bolt right on. Bought car and eventually he will have a good car, that's also a good investment, and carries plenty of reminders of his first car. Win, win, win !