pedal travel help needed

Not sure if its true but I have been told that on conversions the MC often doesn't have a residual check valve. Did the stock Mopar MCs have one? Without it there is extra travel to actuate the drum brakes. I had this issue once (non Mopar) and added an external check valve although I don't recall how much it helped....it was a long time ago.

Residual Pressure Valve placement