'70 Esprit TA clone Pontiac 400
Sorry to burst the bubble. I really, really, didn't want to be that guy and debated for hours whether I should be the one to give you the bad news.what a great forum and community building center. Super awesome to have the....support...
While people like Ed above are enthusiastic hobbyists who will cheer from the sidelines, most have never done the type of extensive metal replacement that car would require. It's expensive and very time consuming, even if you do it yourself. That car needs to be completely stripped to the shell before any rust repair begins. The parts expenses will exceed the value of the car when done, even if you don't count your labor.
Before doing anything with the car I'll recommend you remove the passenger fender and verify that the VIN stamped in the firewall matches. The fender itself isn't a '70 fender. If the cowl VIN doesn't match you might have recourse with the seller. The dash VIN can be fairly easily swapped from car to car while the hidden cowl VIN stamp can't.