1969 power brake metering valve location

[JHS]

One of the previous owners took the power booster off of the car. It only has the master cylinder and the distribution block in the engine compartment area. I am trying to determine if I need the round proportioning/metering valve and, if so, where it should be mounted. I can find no engine pics of the proper configuration. My 1967 Z has the distribution block mounted to the firewall with a bracket; the metering valve (or whatever it is called) is mounted to the power booster with a bracket. I did not know if this is the same setup for a 1969 or not as someone removed the booster.