If you already have the 3.5" kit I wouldn't even bother with spacers; especially if it's a daily driver. 5 Inches of suspension lift will definitely impact all your steering geometry, and drive-line angles in a way you cannot fix with stock parts. So death wobble, mega-vibes, as well as tire wear from being off camber all the time. What size tire are you trying to clear? If it's 33" or smaller I would look at trimming before I threw more budget-minded parts at my Jeep. You can get away with them once in a while, but you get to a point where you would be better off having been patient and saved the money for a proper lift.
Take some time and peruse the forums, and you'll find all sorts of "shoulda coulda" stories, all starting with a veteran warning them of just that.
'96 ZJ 4.0 NP242 5.5" Iron Rock Off Road Critical Path Long Arm sitting on 33x12.5x15 Goodyear Duratracs
'06 WK 3.7 2wd stock as a rock.
North Texas Grands:
Youtube wheeling vids (mostly from Bridgeport):
Grand Slam Texas!: