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Another oil with high zinc is the Lucas brand of Hot Rod Oil, available at Summit, I am using 20/50 high zinc in some of my flat tappet motors.
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Ah yes, the Lucas is available here as well, but much more expensive. I know the Lucas should have a higher ZDDP content (I believe around 2000 PPM), this MPM stuff runs around 1200 PPM I believe. We'll see, it might still be 'overkill' with the oil bath cam and relatively low pressure valve springs.
But I'd rather spend a little more on oil than on a new camshaft and lifters..