Oil for Roller Cam

No matter what you hear, I would stick with using some zinc, either in the oil or as an additive. Zinc protects metal to metal surface contact - period, and even roller set ups still have surface contact. Certainly less critical with a mild roller build but why chance it?
IMO, if you don't have a catilytic converter to foul out, why take the chance... Also if this is a new rebuild break it in with a high zinc break in oil (non synthetic) for a couple hundred miles.