Peter:
Thanks for finding the post! Here is a "hot" link to it:
http://www.chevelles.com/forum/Forum1/HTML/004554.html
According to "Len" (in the Team Chevelle post), only 722 '69 Chevelles came with the F-41 suspension, which makes any car with that very rare. If it WERE ever on a Yenko Chevelle, it would probably be a "1 of 1" kind of deal.
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LS-6 Chevelle
(450hp, M-22, 4.10 posi,
AM/FM 8-track, red w/black stripes)