"ASAP"??
Holy crap! What's going on, man - are you having some type of a lift kit emergency? I hope everything is okay.
All right, here is just one option:
http://www.tuffcountry.com/lift-kits/chevy/truck/
Tuff Country has a large selection. For your truck application, they sell 15 different styles of lift kits. They come in 2,3 4, & 6 inch heights and can be with or without rear blocks, 52" springs, EZ ride or not, etc.... It comes as a complete kit - you shouldn't need much of anything else.
For example, here is what you get when you purchase an EZ -Ride kit for an 87 3/4 ton truck with 52" springs:
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Look through their catalog, call them for advice and pick out what you would like. When you know what you want, go see your local authorized Tuff Country dealer:
Michigan Truck Spring
3649 Wolf Rd
Saginaw MI 48601
United States
Buy your kit from the dealer and install it (approximate installation time is 4-6 hours). Later that afternoon - when you are all done - your truck should end up looking something like this:
You must be registered for see images attach
BTW - bring plenty of money. It will probably be close to a grand for one of these kits.