1965 dart gt spring question
Interesting that you should mention them. The first set of 6 leaf springs came from ESPO and was their standard configuration. It raised the back of a '73 Duster by 2". I am sure the nice lady that answers the phone is not out to get me. But that is what happened.
The second set of 6 leaf springs came from an unknown source, as they were on the car, a '74 Duster, when I purchased it. Now some people like the "pro stock" look on Dusters. I don't, and there are several ways to adjust the ride height.
But this is all off topic from the original post. Which is that the OP didn't like the ride height of his car. Where his first step would be to get the rear suspension working correctly.