I have a 70 Dart Swinger 340 tubbed out with SS springs. Not sure what type shocks are on the rear but when I go over a small dip in the road the shocks bottom out so bad it rattles your teeth. I thought about changing everything to a 4 link but was told to leave the SS springs on the car. What can I do with the shocks? Coil overs?  

comp engineering 3-way adjustable drag shocks or fab some brakets.
I had the same problem with my kyb shock & ss springs , the shocks didn't extend enough due to the ss springs raising up the the car.