Max,
I am familiar with "Schukei Chevrolet", in Mason City Iowa. They were one of the accounts for our Dealership consulting services business
http://www.schukei.com/.
I can tell you that they did have some very high performance minded personnel working there. Mostly in the parts and service department. I have seen a few very special Hi-Po Muscle cars sold out of there.
One special Car which comes to mind and if my memory serves, is the 1969 427 L72 Wagon a.k.a. The Lead Sled, which was ordered and sold new from there.