That is definitely a serious kit. Great rear shocks. Question is, do you really need all of that, and are you prepared for all of the added road noise with those rod ends?
What are you considering this for? If its for a street/strip car with 500+rwhp and you could car less about road noise, then go for it. All I can say is, don't forget about the tire.
I have an adjustable upper, the relocation brackets, rear coilovers with 50/50 lakewood drag shocks, J&M LCA's with polyurethane bushings---quite a bit less then that kit and I have a best 60' of 1.473. I am considering a anti roll bar, but haven't gotten one yet.
If you do get the kit, I would be interested to hear your feedback when you take it to the track.