There is more to it than just filling out a card and having comp grind you a cam. What are your goals for the truck. Do you plan on putting a stall in the tranny. What other mods do you have. Do you even have long tube header. With out supporting mods, when you swap in the cam you can only expect to get 10-15 more HP. The truck will also need to by dyno tuned so it will drive correctly.
In your case i would not even bother with a cam. Get what are called bolt on mods.
1 Full exhause with long tube headers
2 Port and polished throttle body.
3. Under drive pulley,
4. cold air Intake
5. LSX intake manifold
6. Full dyno tune.
You can expect 30-40 increase in RWHP with this list. If you want more HP expect to spend another 2k for heads and cam. You will also need another 2k for a tranny that can handle the HP.
ls1tech.com has a wealth of knowledge.