'71 Dart rear leaf springs ?s

One of the previous owners of my '71 Dart GT installed (or had someone install) new rear leaf springs.

I'm sure there is a "front" and "rear" eyelet on each spring. Is it possible a spring was installed in the wrong orientation (front to rear & rear to front)? How would I check this? Is the perch pin equal distance between the front and rear eyelets? Or, is the distance from the perch pin different between the front and rear eyelets?

I ask these questions, because the rear axle does not "appear" to be straight in the car. On the driver side there is a larger gap between the tire and the front of the quarter panel, whereas the gap between the tire and the front of the quarter panel is much smaller on the passenger side.

What else should I consider?