BTW I got the idea for using this Zink as a puzzle because I was reading a report on the 1969 Watkins Glen 6-hours and noticed that a Zink had optimistically been entered in the up-to-2 litre sports-racing class. It finished 13th overall and second in class to a Porsche 906! The other entrants in the class were a 904 which retired, 2 Sprites and a Unipower, all of which were flagged-off for being too slow.
That's how I find many of my puzzles, just stumbling upon them by chance in books or magazines.