sheesh! don't give him too much negative input longhair! he might just take his front driveshaft out FOR GOOD!
a decent 4X shop... or even the guys at superlift will give you the right info for shimming or rotating your perch angles. just measure the distance of your driveshafts, and you should be okay
p.s. i've run both shimmed and cut/welded perches before with 6-8" lift height... i DO reccomend upgrading your u-joints, and getting bigger balanced drive shafts, but you should be okay