OK, Galen's book shows it as a one and only for a12 '70 300 Hurst cars. Thanks for the good information. It's has a good home in my '70 Runner so I'll probably just leave it there. Thought maybe I struck gold when I saw how it was listed :-)
Found this radiator sitting in my '70 Roadrunner awhile back. Very sound condition. Books shows it to be a 1970 C-body A12 radiator. A12 being the Hurst 300 option. Am I mistaken? I'm by no means an expert on C bodies. I have the shroud for it. WIW?