Advice asked for widthening rims on a 70 Duster

Thnx George Jets, they look nice Looking at your picture, I guess a 235 would fit too?

Dusters have a bigger wheel opening on the rear quarters compared to the Darts so they can accept a bigger tire.

235s go into the 60 series tires . . . a little less height than the 70 series.

Depends on the look you are going for.