Carter AFB 4326s carburetor
I found it and it is immaculate and dry condition. Wrapped and in secure storage box for 50 years.
The number on it = 4327s That is what came on my 1967 RT
It is non emission 750 CFM with small mouth and 11/16 front and secondaries 11/16 throttle blades
and I do not think we every took it apart or messed with it. Replaced it with a 780 Holley in 1967.
