No more then 14 inches of travel.
Talk to Brink, he deals FOA and can get you a good deal. You'll be into a complete coil over set up with springs for under 2k. When you consider that takes care of your shocks, your springs, and comes with infinate adjustability it really is a good way to go.
Like I said, just use currie towers for mounting. Just dont forget to brace them. You can find them here.
http://www.currieenterprises.com/cestore/Product569.aspx?id=2606Stan from northridge does great deals on currie stuff. Give him a call.
For mounting bracketry look at ballistic, spydertrax, ruff stuff, poly performance, and blue torch.
If you are really serious about doing this build, you might want to bring a pad, paper, and a large tim hortons coffee by my garage and get some advice before you take the big steps.
hth