with out alot of fabrication experiance and know how i would not try to go spring over yet. i would replace the spring under leafs and get the slip yoke eliminator and extended brake lines and all the other fun stuff. dont dicard your old spring keep them. after insalling the full lift and tuneing it and perfecting it then i would try a spring over setup. not only will you have more practical knowledge of your jeep and more of the experiance you need, you'll also have the stuff and ability to compare the performance of the spring over lift vs. spring under. and if you dont grind off yur old spring perches right away, you can reinstall the old lift without having too much work.