Cam wise i dont deal with that company so i dont know much about their product.
the basics,
stage 1 - cam only , no tune needed but will help
stage 2 cam only , tune needed
stage 3 - headers needed, tune must, torque converter almost a must, heads a must
Prior to a cam purchase you'll need to know what the overall goal of the car is gonna be. Your gonna need cam a for mds, cam b for turbo, cam c for nitrous and cam d for stroker so you have to know the finished product prior to the cam purchase