There are a lot of companies that make lift kits for your truck that come with both new front and back springs instead of blocks in the rear. Take your pick Rancho, Skyjacker, Tough Country, Rough Country...the list goes on and on. It will cost you about $300 more than a lift kit with blocks, but it is a better way to go.
I am thinking of ripping out the crummy 3-inch Rancho suspension lift (springs in the front and blocks in the rear) that came with my truck when I bought it. I want to replace it with a 4-inch shackle flip and greasable bushings kit from ORD, custom made rear OEM springs from Alcan, and custom made 4-inch lift front springs, also from Alcan.