IIRC, all the rocker arms have the same thread. The lock nut style screws are a standard thread, the non locknut are a special machined interference fit. Age, a wire brush, or worse a tap will remove the interference fit and then they just get loose. Made that mistake years ago. I prefer the lock nut style, but I only do cold adjustments with the engine off. Plugs out so I can easily rotate the engine and my dampener is marked every 90 degrees. Even with higher lift cams and rpm’s near or over 5000 rpm, you don’t need to adjust valves that often.
Here’s an old post on valve adjustment. The first post has the Walt Knuckles method, and below is a link to several others by Ted Eaton.
http://forums.y-blocksforever.com/Topic96773.aspx