there are a couple people in my club who run this set up, and it was factory in the FSJ's Not bad, but to get the spring heights to match, you might need to mix and match spring packs and or shackle to get it to look level.
personally I would SOA the front and SUA the rear, no worry about axle wrap and the extra weight of the motor will allow the flatter stock springs to flatten out more to level.
Would the Soa on the front not cause more axel wrap with the added weight of the motor???
Also my problem is with the rear lift springs they must just be to stiff with no weight on them.