You should go over to ramchargercentral.com and explore the "shackle flip", you eliminate the block, flip the shackle for you lift, it gives a surprising amount of lift too. Pinion angle is my only concern. Plus you can mount the shackle lower on the frame or build a custom shackle (they have plans on the site)to mount same place with a lower hang to achieve the high lift the 4x4 nutz seem to like. I love the poorboy DIY stuff...
Ross