Good choice. Control arms (lowers) are going to be for caster assuming ?
3" is borderline considering most lifts are higher then listed. Especially if the jeep is lighter.
Will you need them? Most likely, a 3" kit is going to raise the jeep around 4" in the front.
But... Install the lift and drive it first. Low caster caused flighty steering. If you find this to be the case you can always add later.