After my experience with those springs it was clear to me they were designed for a light 108" wheelbase car, not a heavier 111" wheelbase Dart. I have a solution for these springs but most want the cheapest parts they can get.
Not to stir the pot.(esp since I have worn stock everything) but, even the heaviest A is only 100-200lbs more than what would be an average abode weight.
Would that small of a weight make such a difference?