BAMFIT

I was impressed by the design skyjacker has when it comes to getting more lift without a larger block. Everywhere Ive read says that a leaf is far more functional. I'm undecided on 4" vs 6" but was curious as to my options getting a decent lift (which usually only include full suspension changes up front and then a block in the rear. And how many/what type of leaf would I need to add to be levek with a 4" front lift and 6" front lift? Thanks