I have a 1965 Sunbeam Tiger with an early 289 Ford V8, performance Cam & flat tappets. I have been told to use a High ZDP (Zinc) oil, like PENN 1 10W40, to keep the Cam and Tappets from wearing. The previous owner was using Castrol GTX 5W30 for street use, but the original builder used RED-2001 10W40 for Auto Cross racing. Can I use Havoline 10W40 for street use without undue wear on the Cam & Tappets, or should I change to the high ZDP race oil like PENN grade 1?