Stupid question???

XHD leaf springs should get you where you want.

If you want to do it right,this is the only way. XHD springs.

Do not use air shocks. Bad idea on A-bodys. The pressure the shocks put on the upper shock mount bolt has been known to break it. Not good.

Extra heavy duty springs have an extra leaf which will kick the back up.
If a raked look is what your going for this is the way.