Zinc Rich Oil for Flat Tappet Cams

I got a moderate/mild cam on my bone stock 318 (comp K20-212 with lifters & springs) and I used the break-in lubricant that came packaged with. I noticed that of all the Mobil 1 listed, the lowest amount of ZDDP was 750 ppm and most was 900 or up to 1300 for the tappet formula (1850 ppm race).
All I did was a cautious break in and I'm using plain old Pennzoil. I don't do a lot of high rpm maneuvers with high dynamic pressure which is where I think the main problem is.
Another important thing, maybe most important, is adequate oil pressure. So when I did the cam & timing chain I went ahead and put in a new oil pump at the same time, so I'm like 60+ psi cold or at anything above 1500 rpm, and as low as 25 psi if it's hot & idling at 600 rpm.
I've got an astoundingly unremarkable motor that I use to do unremarkable things, Pennzoil is probably adequate. If it's not - no big loss.