Good info, thanks. The car is located in another state, so these pix are all I have to work from.
More research just revealed:
C3AZ 9424-C (C1AE 9424-C) - 390, 406/4v Alum ('69 Blue Bible - Galaxie HiPo)
C6AZ 9424-M (C6AE 9425-?) - (62-up) 390, 406/4v Alum Equal Runner ('69 Blue Bible - HiPo)