You've got a lil bit of wrong info here.
Motion was a Hi-performance shop,not a new car Chevrolet dealership.
Baldwin Chevrolet was the dealership nearby that would often sell customers new vehicles,then send them over to Joel Rosen @ Motion Performance for modifications,per the customers request.
Read here..
http://www.motorbooks.com/motorbooks...-Joel-Rosen/43
Post photos of your Nova..