Just addin a little to NY's post.
1- The struts are facrory length and the shocks are a little longer (acording to lift) with the Calmini lift Kits.
2- Yes the lift is achieved with the Control arms and the fron springs are not needed. I have ran this kit on two of my vehicles now and have had now trouble at all of ot it.
3-For off road based vehicle I would highly reccomend the 3" over the 2". There are a few fairly simple mods you can do to tweek the already flexable kit into a great off road kit, where the 2" is prety much maxed out without you fabing new parts. But on the other hand if you are going to primarly bee on road the 2" kit will ride better. The 3" was designed for the extra weight od a winch, bumpers, roll cage, etc... and will ride fairly rough without the extra weight.
Zig