What about zinc?

Mobil 1 lists the zddp content (which is what you're really after) for every flavor that they make.
Review it, and see if you can find published info for your preferred oil choice.
It's supposed to be more critical in a new cam application, but I had tons in my 360 and it still wiped 2 lobes. I'm a roller cam man, now, but I don't know if that's even an option for slant 6's