I'd say run the ruf or buy some springs from a vendor. The stock pack isn't going to give you enough lift, even if you add leaves. It's going to look like a stinkbug. All you need for ruf is 2 stock rear packs (which you have one of, just need another). Only thing with ruf is you need crossover or high steer. Putting the packs together isn't hard at all. Take a look at the ruf and 63" chevy faq's and do some searching on your own, all questions and concerns will be answered.