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At speed...full race 67 Z/28, March 1967...I think it's safe to say that Yenko was the one to beat in 67... keep in mind they also converted 50+ SS cars to 427s this same year too....in addition to continuing with the Corvair Stinger program, Sunray D-X L88 corvettes, etc.
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My attachment shows a Yenko Stormer (302 Z-28) which was driven by Bud Gates at the Sebring Trans-Am on 3-31-67. It was a red Z-28 ordered through Span and was part of a two-car Yenko team at Sebring. I'm pretty confident it is the same car as posted by camarojoe above.
-Jon