Anybody with cpp 4° lowering blocks?

[carbon69]

Just wondering if anybody is using the lowering blocks that cpp sells. I picked up the 1.5" blocks that lower and supposedly correct the pinion angle for dropped trucks. The truck is already lowered in the back with 6" lowering springs. If anybody here is running a similar set up, which direction did you install them? I know I need to check angles, just figured there is a right and wrong direction.

-67c10 swb trailing arm rear.