Not in 67.
No multiplex radios in 67 Camaros from the factory. 8 track only went on the floor on top of the transmission hump or on the front of the console facing backwards, and they were stereo using 4 speakers mounted in the corners. Radio was only mono.
Dealers would assemble the parts and stick multiplex units from other car models where ever they could, mostly under the passenger side dash between the glove box and the center of the dash. There.s no instruction for a dealer installing a non factory option, they just figured it out.