Rob, I´m not an expert on these things, but I try to listen and learn when the experts talk.
Marlin presented these "facts" at the SCR8 banquet. And your father Tom, together with Brian Henderson, did the same thing in an article in Musclecar Power. That´s where I learned about it.
So I think it´s only right to have the most up to date info on the best Yenko-site: The Supercar Registry !