More information is needed to answer any question about spring rates and shocks. The stock spring rates front and rear are 100#. I race my car and have 200# in front and 250# in the rear. It actually still rides well enough to drive on the street. There are a million different combinations for the suspension. You have to decide what you are going to use the car for first, then start tweaking the suspension.
@curtissb thanks. Good start.