Tell me again about adjustable? stud rockers for EQ mag heads?

Crane also makes a kit to convert them. They are 5/16 studs on the bottom and 3/8 on top. Since they are only 5/16 they cannot take a lot of spring pressure, but if you are going with a relatively mild build, they will work fine. Then you use a Chevy rocker arm for a 3/8 stud.

This same kit also works on later Ford small blocks. I have it installed myself on the 5.0 roller motor I built for the RobKat. It's a nice kit. I used the Comp ductile iron rockers on mine.

Here is the kit from Crane.

https://www.summitracing.com/parts/crn-36655-16/overview/