Re: Type of oil and oil filter for a 69 427 engine.
There are a lot of oils out there with higher zinc amounts besides ZR1 (which I believe Valvoline has 2 different blends): Brad Penn, Lucas Hot Rod, Schaeffer Racing Oil, Royal Purple all have high zinc numbers. Just choose the oil that is easy enough to buy or read the data specs (found on each company's websites) on them all and choose the one you seem to like the best.
As for oil filters, I do believe that the Wix filters are a step above AC's, but that is my opinion.
Oil weight: 10w-30 and 10w-40 have seemed to work for the past half a century, why change now? Being in Texas, I also don't see why 15w-40 wouldn't work either.