This caught my attention and I checked my '67, '68 & '69 Option Brochures and thought I would let you know if you don't.
This appears to be a '69 Only Option was available on All Models. It's interesting this unit was specialized for the OHC,
but would think it could be installed on any model with minor mods/fitting changes.
If I had a '69 I would grab this up.
You may want to broaden your ad over into other sections.
Cheers.
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When I die, I want to go peacefully like my grandfather did, in his sleep.
Not screaming like the passengers in his car.