10" on a stock 73 Duster?

Okay. To fit a ten under the fender of most a or B mopars, you would need at least a five inch backspace, 5.5 would be better.
So, those wheels with that tire will stick outside the fender a couple inches. So to keep from cutting them up with your fender, plan on jacking up the rear of the car about four or five inches from where it likely is now.
In other words, don't. My opinion only.