Magnum heads convert to sbc rockers?

It's the hot set-up. The SBC rocker swap is one of the most common conversions, and the thicker studs aid in reducing deflection. The stud girdle kits will then also fit. Take a look at the Jomar girdles.
Are you saying that the SBC Jomar girdles will work on the magnum heads, the rocker spacing is the same ???