First off, you already have purchased the shackles, so use them. Second suggestion would be a small body lift, one inch. Quit relying on info from some of these guys. I thought I was reading a forum on pirate for a little while. This fellow wants to get into this jeep thing, and catches a whole lot of crap from those that should be helping him.
What size tires you planning on running, and do you already have them? Wheels? backspacing on factory rims will be your enemy.
A yj? first mod you should do is remove the track bars and toss them.