I'm going to tell you right now that AAL's AND shackles is too much rear lift for the front UCA's. THe AAL's and shackles will lift the rear 2-4 inches depending on which combination and how much weight you pack in back. The factory UCA's can only be lifted about 1" (maybe 1.5" max if your truck is a bit low now) or so without alignment and suspension travel problems. So, even with the AAL's alone you will be getting an ass high stance. Add the shackles and it will just be rediculous.
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ChuckH
"Every morning when I wake up I know it's not going to get any better 'til I go back to sleep again!" Al Bundy