Thanks Scott. When I bought the 'Cuda it had a pair of new Eaton springs on it that were labeled (+2). I assumed that meant that they had an extra couple of inches of arch in them. I bought a used pair of springs from a racer friend of mine. They came off of his '69 440 Barracuda. He was switching to a single leaf setup with Caltracs.
It dropped my back end down to where I wanted it to be. I've been running the shocks that came with the car. I don't know much about them other than that they're gas charged. I used to think that the ride was too stiff but after I swapped in the Dana and added the sub-frame connectors it's seemed to ride smoother. I still haven't gotten around to installing those CE drag shocks yet. With all 4 on the car including the 90/10s on the front I imagine the ride quality will suffer.