Hi Bobby,
There is a lot of noise in the blogs regarding this matter and Vavoline VR1 20-50 racing oil for street or tract.
Regarding ZDP level and flat tappet engines.
Bulletin from Vavoline --->
https://www.valvoline.com/downloads/2008-003a.pdf
I went with Racing VR1 20-50 plus one quart of Lucas Heavy Duty Oil Stabilizer.
My BJ7 is very happy, it's hot down here in Florida, I get 60PSI on cold start and 50-55 when running hot, 20 idle.
Also, I was having trouble with over heating, flushed the radiator, added 3/4 water 1/3 antifreeze and Red Line water wetter.
She runs right at 190 now or lower and when stopped for a long time holds steady at 200-210 in Florida.
I may try an improve on this by running a six blade fan and add more wetter.
Fishplate101