If you go back with stock specs, yes, but if you do an alignment more for performance then no. Marcus was trying to sell you something, I can guarantee it.The guy at SC&C said that you needed new upper a arms or it would not align properly.
And as far as I can tell only the lowers cause the ride to to lower, by raising the spindle. Raising the upper a arm should not change ride height.
I have read on pro touring site where a couple people have installed them incorrectly like upside down or something and have cracked one of the plates that hold the bj but it was pointed out and the owner fixed it and didn't have any further problems. I like to go with facts on products and not just speculation. I try and do as much research as possible before buying something like that and don't base my final outcome on one opinion for a lot of reasons.