If you want to do anything to the rockers, run dual guides. Get your machinist to modify the rocker arm to accept the guide on the other side of the rocker.
You will see what I mean when you look at one. Running both guides stops the sideways movement and will help prevent rockers from flying off.
Been running this setup for a while to 8200rpm no probs. Keep your rev limiter span at a decent RPM range as well ( at least 500rpm).
Pic for reference.