I saw something interesting the other day- a pretty good 70 body on a bad chassis. It brings up a couple of questions. What newer chassis from a Mustang would fit under it with the least modifications- Fox body, 05 or newer? Could you keep the original engine options easily?
Newer body is wider so you would have to modify a lot to make it work . You could go with a Dynacorn floor pan assembly and replace the whole sub structure