Dont overlook the fact that the Greddy kit comes with a cast manifold, and no FMIC. Plus who wants to use 370's on a topmount setup anyways(greddy kit).
I'd pick this kit anyday over the Greddy kit.
Also note, this kits price is a shipped price. You know all those parts cost at least 100 bux or more to ship. It really is hard to beat.