Stop in for a cup of coffee
I really know nothing about that engine. the 70psi of oil pressure was when it was warmed up too. the VR1 20-50 was the only oil I could find with zinc in it. (my original plan was to buy o'reillys brand 10-40 and put a bottle of zinc additive) but guess what? they were out of stock and couldn't tell me when they would get it back in stock.
Correct viscosity is
far more important than the anti-wear additives.
At 180*F 10W-40 is around 25 cS, and a conventional 10w-30 is around 18 centistokes.
At 212*F 10W-40 is around 15 cS, and a conventional 10w-30 is around 10 centistokes.
Those are the factory recomended oil grades, with 10W-40 really not for cold weather because its still a bit too thick at 180*F.
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For higher than 800 ppm in zinc in a conventional oil
Ford Super Heavyduty 10W-30, meets FORD WSS-M2C171-F1
it's pretty readily available.
One of the better options available for a relatively high ZDDP package in a conventional oil. Plenty for stock engine, stock spring presures. etc. Probably group II base oil. No API cert, and obviously Ford won't recommend it for cars with cats due to the potential long term warrenty issues.
Here's an oil analysis
PETROLEUM QUALITY INSTITUTE OF AMERICA TEST PROGRAM-Ford Superduty 10W-30