Anyone running catalytic converters on car with flat tappet cam?

Good question, I have no idea how much zinc or over what duration of time it would take to ruin the cats. What is the happen medium, its like a catch 22, you need a certain amount of zinc especially with a high lift cam, but not too much that it will destroy the expensive high flow cats. What is minimum amount of zinc that is required for flat tappets with a high lift cam?
The only reason I'm running cats is due to my health otherwise this wouldn't be an issue.