I own a slightly modified 96 Cobra with 69k miles. The suspension is original stock. I'm considering Max. Mot. Starter Box which includes H&R race springs, cast/camb plates, pinion snubber, Bilstein sport-valved struts/shocks and spring isolators. They're asking $ 1,118. Is this the right way to go? Should I consider a coil-over set-up? Are cast/cam plates necessary? Thank you in advance.