The Wag front is spring under and the rear is spring over. You can easily weld a spring perch onto the diff casting on the front to make it spring over though. Very little difficulty is added by this, especially considering that you'll be moving all the other perches anyways. Another good option is to get your hands on an older F250 high pinion Dana 44 and shorten it to take the Wag shafts like we did for Brian's Jeep. The F250 front is already spring over, but you still need to move the spring centering bolt hole in the casting and do some grinding to really make the U-bolts fit right. The effort is well worth it though.
Take a look at this for info on the high steering arms http://www.outdoorwire.com/4x4/jeep/tech/steer/SOA/
I really reccomend you go with high steering arms for a spring over. Also, check out the ladder bar in the first article I mentioned. You really need something like this to help stop axle wrap when using YJ springs. While I'm thinking about springs, aftermarket springs are a good idea when going SOA. The 2" lift springs for a YJ from BDS are the best I've seen for a spring over Jeep, and they are cheap. Rubicon Express sells some similar springs, I don't know their prices though.