The rear is 52 in from backing plate to backing plate, the rear frame width is 41 inches and from the tire sidewall to the fenderwell is 4.5 inches. I am running a 118 inch wheelbase with a speedway motors i beam front end. One of the joys of those years mopars is the only wood in them is to connect the interior to, the structure is all metal. The whole interior seems a little wider than a model a.
The main thing is whatever you get, if you build it or have it built for you, if you trailer or drive it, just have fun and enjoy. I have meet some great people through this hobby, some drive $100.000 billet cars and some drive rat rods. Just have fun.
Bob
34 dodge