I bought a Vortech tuner kit for my revup from Adam@Z1, and only had it tuned last week.
IMO forget about the full kit. Get the tuner kit, a set of larger injectors and a pump and a UTEC or better, and you'll be much better off. I went with the Haltech Platinum ECU, which absolutely thrilled my tuner, because it was so easy to tune and he made 400whp. But that would cost more, so it's your choice.
I understand the following couple of lines might sound like I'm a fanboy, but Adam was probably the best trader I've ever used on an online purchase, so you can't go wrong with him. He has knowledge of Z, and he sounded like an enthusiast to me, and that's good in my book as far as traders go!
And his shipping rates are simply unbeatable.
OP, if you need to know more, PM me.