[JoeC]

The old Canonsburg Yenko Dealership was too small even to operate as a normal Chevy Dealership so must have been very tight with additional work such as Don building/maintaining his Corvette race cars, and processing the Supercars. Don was also working on marketing a rear engine car called a "Scropio" in his dealer network in the late 60s.
In the new Yenko Dealership radio announcement, Donna Mae commented how they were tripping over each at the Canonsburg Yenko Dealership and the new larger RT19 Yenko Dealership was a welcome improvement in size.
I believe Yenko had to offload some of the car building labor just because it could not all be done at the Canonsburg Dealership due to lack of room and labor hours.