I dont know if your interested but I just pulled my copper radiator, its like 3-4 years old with less than 500 miles of driving. I relpaced it with an aluminum. There were no problems and no leaks, it is a 23". I will check to see if it is 3 or 4 core. PM me if your interested.

And yes all first gen Firebird and Camaro rediators will fit.