need some help clarifying the vr1 race oil

I've used conventional high zinc "racing" oil to break in engines. But I'm running out and have stocked up on 15w-40 diesel oils from several years back that still had a decent amount of zinc, plus I bought Comp Cams break-in additives. After that, Amsoil Dominator 5w-20. But I have clearances on the tight side.

Amsoil has a variety of synthetic oils that have a lot of zinc in them.

http://www.amsoil.com/techservicesbulletin/motoroil/tsb mo-2007-08-08 flat tappet.pdf