I have a scan of the photo.
Here's a link to all the photos we've collected from the California Beach shoot:
Like Rich, I have often wondered how this photo found it's way to the cover of Chilton's Motor/Age in June 1970, approximately 3 years after it was originally taken...
BTW, still hoping to find an original copy of the June 1970 Motor/Age publication as there might be additional clues contained within...