Oil zddp ?

ir3333 said

I'm betting thousands of flat tappet cams have had long healthy lives
running regular 10w30 Dino oil with 800 ppm zinc or whatever.

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this is true to a point. I called Valvoline company itself. They said if a car already has 60,000+ miles on it, the extra zinc isn't necessary. But new cams/lifters, it's very critical, especially the first few thousand miles while things continue to break in.
Of course, when you start adding high pressure valve springs, and higher lift cams, it all becomes that much more critical.