The only differences were some options for the Sport were standard on the Classic.
So, just to make sure I got this straight - you put 3" blocks on the rear (already a no-no), 3" coils with 1" spacers on the front (total of 4" front, 3" rear) on 31's? That's not going to level you out. That'll make your nose sit high. Most you need to level out (if you even need to) is maybe another .5" up front. I've got a Rusty's 3" (full leaf packs, coils up front) that's 2 years old and I sit level.
He's got a 4.5" lift (rear leafs, front coils - no blocks or spacers) and 32's. That's gonna make him 1" higher in the front and 2" higher in the rear, not 3". If his lift is new, it'll take a little bit of time for it to settle to the actual 4.5".