I bought the Rotella T that we tested two months ago. It was conventional (non-synthetic) oil. The VR1 that was tested was the type in the silver bottle.
As far as how much ZDDP is needed for flat tappet cams - I don't know. But I've heard that 1200-1500 ppm is optimal. I have also read on some message boards that too much ZDDP can actually increase wear, BUT have never seen any data or cited references to back that up. I do know that it is the phosphorus, not the zinc, in ZDDP that provides the anti-wear protection.