If your engine still has the stock unhardened valve seats,the idea is to use an oil with as high a level of ZDDP,which has been decreasing, to lubricate the valves. Google it, you'll get no end of articles.
If you have hardened valve seats,just use a good quality oil.
The high ZDDP will lubricate the cam and lifters, benefiting that area. Really don't think oil should be in the area of the valve seats. I am running Brad Penn.
Duh, I am confusing two separate issues. Tim Mcmaster did recommend I use Brad penn oil when he built my current Y,which I do use but have to special order it. I was worried about using a lead substitute for the valves, but he installed heads with the hardened seats, so it's a non-issue now. I was ready to install the NOS oiler kit I had bought,which he said is not necessary with modern detergent oils and the common mod used to correct poor oiling problems.Sorry about the bad info, I'm easily confused.