Need Direction Possible 1969 RS COPO Camaro

[michiganjim]

Just recently discovered that my 1969 Camaro which I thought was an RS/SS car is leaning more toward a COPO car. Car has been in barn storage for 32 years kids grew up and finally have time for my interests. It has a 140 MPH Speedo, 13/16" front sway bar and 12 bolt differential not sure of gearing haven't taken apart yet. Possible the car is one of the 58 RS COPO's. Motor/Trans are not original bought car as a shell in 1982. Do know that the car was originally purchased at a dealership in the Cleveland area. Haven't had any luck tracking the VIN number other than being able to find the original dealer. Anyone have a suggestion where to start? Appreciate the help.