I have used those same rockers (the unbushed comps) at 580 open seat pressure with zero problems. It's a solid roller .648 lift and 262@.050. I drive the heck out of it, and beat on it at the strip as well. The shafts are just whatever came with the rockers. I have never checked the side clearance, but there is not very much at all since I use the Hughes shaft hold downs. If I remember right, I had to mill a little off the sides of thos hold downs to get them to work.