Don, first off thanks for the offer on the springs in your other post! I'm pretty sure mine are okay just in need of cleaning.
My truck has a leaf stack of nine then a one inch block followed by a five leaf stack at the top, with a normal spring perch on the axle. It also has a plate steel bed so you can imagine how it rides. How many inches does the rear need to be raised? If it's a couple of inches I would think a block would work fine.
Kim