Super Stock or Stock Style Leaf Springs for my 69 Barracuda.

If you're still getting the "hard shake" (likely wheel-hop) on hard launches, get the stiffest shocks you can - 9-way Rancho or Cal-Tracs. The harder a car launches, the stiffer the shocks need to be to control spring wrap-up & un-wrap. You will likely still spin, but it will be smooth.