Thanks for posting that link, Tim. Below is a great color shot of that red Bud Gates Yenko Stormer at Sebring and it looks to me like Don Yenko is behind the wheel, however he had been banned from competition by the SCCA for 6 months for ignoring a black flag at the ARRC event in November '66.
Also below is a color picture of the blue Bill Boye Yenko Stormer Z-28 taken in July '67 prior to the Paul Revere 250 at Daytona. This was the car's first race. Fred Coyne was the Chevrolet dealer in Vero Beach, FL which is where Boye was from.