Yenko did do customer conversions such as the 1975 Yenko Trans Am L-88.
It would be hard to prove without original paperwork like the L-88 Trans Am has or an old magazine/news article or ad.
There was also a Yenko Turbo Corvette that was in a magazine article back in the day and other special Yenko built cars.
Yenko did a VW Karmann Ghia Corvair engine conversion for a customer documented by a for sale ad from back in the day
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