[davenkc]

Good answer, Exactly why the "flip top" all fiberglass body came into being displacing the "door cars" (ie)Cars like Dick's 67. Steel or "real cars" rear clip with glass components front end doors etc. The weight and as is said today aero. The older cars could still be made to compete but more hp created the problem with available traction.
The evolution of the funny car had begun.
Yes Bruce Larson is another who had a 66-67 Chevelle. And with more thought I am not sure if it was Bobby Wood as I said or Jim Maybeck. Malcom Durham early on I believe to.
But I never saw a 68-72 Chevelle f/c.
enough for now
Dave