if you do an AAL you would even have to remove the main leaf, skirting the frame mount bolt tat always hoses you XJ guys.
I've got an AAL in the rear of my MJ, it's not horrible, it stiffened up the rear some, but still flexes OK.
Don't do rusty's. My brother had a rustys 3" kit on his XJ, it's since been replaced with RE. RE rides better, and will likely last a lot longer than the rusty's springs did.