Is it worth it?

The dash pad is no big deal as you can get a replacement or cover. Other interior is available too at a cost of course.

8 3/4 must have been added as they didn't usually come that way, not until '66 I'm pretty sure. Check to see if the bolt pattern on the rear matches the front. 4" or 4.5"? Does it have any disc brakes up front?

Are you looking for a project cause that's what it sounds like? A running driving project is more fun for sure....