[Too Many Projects]

I would say yes, as Yenko, Gibb and others, started the supercar movement with dealer conversions. Polar was in my "neighborhood" and was there often looking or buying the occasional part. I never knew of a '68 conversion, but I was only 16 at that time. A HS friend bought an L78 300 Chevelle new there in '69.
The dealership is still there, just went by it a few days ago. I was on a test ride with my family in 1966, as my Dad wanted a Chevelle and we rode in a Marina blue hardtop. No he didn't buy it, he bought an Aztec Bronze hardtop from Champion Chev instead.