What to look for, 69 cuda
Even if the floorpans are rusty, they're cheap to replace compared to the grilles. I loaned my 69 grilles to Laysons once so he could use them to copy for repops. He wouldn't give them back. I had to convince one of his employees to send them to me when Dave was out of town.
I sold that car to a guy in Australia for $2500 back in 2004. It was a REALLY straight notchback that had all of the trim, in perfect shape. I should have parted it out, but I couldn't do that to such a nice car.
Notchbacks can also collect water at the lower corners of the rear window. Make sure to check there.