How long ago was this? There was a "restored" C7 340/4-speed kicking around the Wausau area quite awhile back (15+ years). Wausau isn't such a stretch from Stevens Point. If that was your old car, someone put it back to the factory color and drivetrain combination. I've no idea where it might be now, but unless it was catastophically wrecked it's gotta still be out there somewhere.
I wish I had more for ya. I don't know a name or anything more specific.