FACTORY SIZE TIRES

My toes are fine. I just didn't see the tie-in between his question and your answer. I see it now, thanks.
I remember that my Dad was given a great deal on a showroom special 1965 4 door 273/4 Dart, that he bought during the Presidents Day sale in 1966. I distinctly remember washing the car in the springtime and the tires were 14". I looked in the tech manual and nothing listed about the tire size. Thought that with a 14" tire I could move to a 15" and have more tire surface on the blacktop.