May Purchase this 73' duster, need some help!

Yep, hoping to bring my father along if he is available to drive down. I'll be giving her a good look over. I'm not experienced at telling when rust is to the point where you really need to replace a section, of course, if there are holes through it that would do it.

Where in MN do you live and where is the car located? I am in St. Cloud and if close by I would be willing to look it over with you.