Tire Size

When it comes to 14s, you can (or used to be able to) change the tire heights just by changing the profiles. I imagine you know about that .
Back when I was a kid, in the 60s and 70s, it was possible to install 14 inch tires so tall, that there would be no way to install them on your Dart. For example; a G78-14, maths out to 27 inches, and I doubt you can put that on your Dart without modifications.