If I am not mistaken the style valve that you may have is located on the heater core itself. Looks like your car has no A/C.
I have a 68/69 B-body heater core. There is a lever that opens and closes the valve. A control cable connects to it. I can take pics of this valve for you tomorrow so can see what it looks like.
The assembly you have pictured is not for the B-Body cars.