My local speed shop is a MOPAR house. I was asking about Brad Penn vs VR-1 and walked out of the place with 6 qts of the Penn. The oil in the engine now is what was used to break in the cam. Will be interesting to see how it looks when I remove it.
The Not for street use is the equivilent of Brad Penn Joe Gibbs, etc. They are all full of zink. The only reason they are "not for street use" is cars with catalytic convertors may have issues with convertor damage due to the high zink content getting into the exhaust system in normal running. It is fine for any engine without cats and is preferred for aggressive flat tappet cams. These are NOT SAE certified oils therefore are not subject to the EPA limits on zink. If the oil you buy (including the VR-1 that carries the SAE gold shield) says it's certified to meet or exceed SM grade it does not have much zink. It will have other anti scuff packages, but it doesnt have much more, and it won't have zink, because in order to carry that SM label it can't.