I have this one from Howell
http://www.howellefi.com/shop/custom...cat=252&page=1
It is reasonably priced at $1200, comes with all GM parts and sensors, it is a complete kit with everything you need. It can also be used with late model computer controled distributor if you want. I have had this kit on my blazer for about 6 years now and have had no problems other than an injector going bad. I have one of their earlier kits that came with a holley aftermarket throttle body and the injecters are not as good as the gm ones.
Brent