There is a set lighter. I have them now and not yet run the car. P4120863/4 for a 2800lbs. car.
All S/S springs will fit the A body but some get listed for B body cars. More leafs on them. Heavier rating.
I have a set of the P3690460/1 springs on my ‘79 B body Magnum. They required longer front hangers. They have a Total stink bug look. I used 2” lowering blocks and the ride looks stock. Will swap them out for less of a drop later.