Tire size for a 68 Dart

I have a 69' GTS. I had a perfect pair of E70-14 redlines from back in the day, and the measurements were almost Identical to a 20575R-14'. However,The car didn't drive like I remembered back then. the tires seemed too big, and had a mind of their own.
I'm strict about the originality and driving characteristics, so tires too big aren't right for me. I went ahead with the 205- 70R-14 in the front, And the dart drove beautifully. I went 21570R-14 for the rear, as I thought also that the 205-70 looked too small in the rear, but I also didn't want too much height.