soa nets 6" above your current height. the better shape your springs are in, the more lift you need in the front to match. 2wd leafs are a bit shorter than 4wd packs, or you can mix and match with XJ or Explorer leafs to get a shorter overall lift. be sure to use new hardware to reassemble the pack, and make sure the main leaf is properly supported. (personally I would try a full XJ pack, with the eyes cut off, put under an MJ main and go from there)
what perches did you go with? got pics of that area with the leafs on top?