well 3.5 springs on soa is huge. i wouldn't do it. if i was bent on keeping my springs i'd make a bastard pack. take those lift springs apart, and replace the second leaf with a stock leaf, that should make it around 7 or 8 total inches.
whats your question on steering. w/ a drop pitman arm and that much of an arched spring you can probably run the stock drag link. the problem comes in when the drag link runs into the front right spring while turning right. you never know if its gonna clear till you build it, some clear and some don't, i've seen no rhyme or reason yet.
after that there's hi steer kits that are great, but not cheap.