Moog has a catalog full of springs wound for all kinds of applications. You need to first research your current free spring height (no weight on the spring out of the car), wire thickness, coil diameter and type (pig tail, open coil or ground flat on the bottom), and finally the spring rate. Once you know that you can look in the catalog to find a spring with same specs only a little bit stiffer spring rate and has two inches less free height.
If you want to drag race the car you also want that with a smaller diameter wire so that it stores more energy on compression. If road racing you need to consider the contribution of the sway bar's spring rate on cornering.