Those rockers look alot like the old High Performance rockers off the VW's.
The only differance is they don't have a hole on the valve side for a stud to go thru.
We used these thing called elephant feet with a 3/4 ball bearing in the end that mated up with the valve tips. They looked like these here.
EMPI SWIVEL-FOOT VALVE ADJUSTING SCREWS.
http://www.jcwhitney.com/swivel-foot.../p2005314.jcwx
They really kept the rocker from beating up the valve tips.
Kurt