By building a set referenced above you should be able to clear 33's, and be able to do it for about $100(2 complete sets of leaves, 4 new center pins and 4 new u-bolts if needed), or less depending on what you have to pay for the leaves and if you buy or make your own center pins of of used bolts. Building a set of springs for lift is a bit of a crap shoot, what will work for one may not work well for another.