High-zinc oil or ZDDP oil additives?

Unless you're running a flat tappet solid lifter cam you don't really need anything other than a good off the shelf synthetic oil, IMHO. I run a Ford 2500cc mini-stock at my local short track with a Lunati solid cam 550/560 lift, turning 7800 RPM. I run a good synthetic oil like Amsoil or Mobil 1 with a bottle of Schneider Cams Formula 3 additive that has all the ZDDP needed. 1/2 bottle (4 oz.) with each oil change (6 quarts). Guys running the hydraulic cams run a good off the shelf oil with no additives and they see no more wear than I do.