Many of the early 67 Z/28s were made into race cars but more like 25 not 200. here is quote from Z/28 web site...
"The first 25 Z-28's were built between Dec. 29, 1966 and Jan. 12, 1967. These went strictly to favored dealers, mostly for reworking as all-out competition cars. Z-28 #1 was shipped to Aero Chevrolet in Alexandria, Va., where it was groomed as Johnny Moore's entry in the Daytona 24-hour Continental. Cars #2, #3, and #4 went to Yenko Chevrolet, Canonsburg, Pa., for driver Ben Poster, also for Daytona."
read more at...
http://www.67z28.com/history.htm