What's the best oils for tappet cam engines?

I want to come back to this to say I was WRONG with what I posted. That actually WAS correct information a while back, but evidently, the EPA has legislated more zinc out to the point that you need to keep adding it, or running oil with zinc even after breakin. My apologies. Here's a good read from Comp on it that's up to date. Sorry bout that.

[ame]http://www.compcams.com/Base/pdf/FlatTappetCamTechBulletin.pdf[/ame]