Valve question

This is not a dumb question. I ran across the same issue when I converted my 73 Dart from drum to disk. When I began, the car had the disk brake master cylinder and a proportioning/metering valve that looked the same as the parts that I liberated from a 75 Valiant. Since it looked the same, I swapped the front and rear brakes on the 73 for BBP disk. Not only did it work, in several panic stops, the fronts locked first. Just as they should without ABS.

To respond to this question, I consulted the FSM and parts manual. The FSM stated that drum brake cars used a simple T with a switch. There are four connections to this T. 2 each from the master cylinder and the wheels. The combination distribution-metering-proportioning valve has five connections. 2 from the master cylinder, one to each front wheel and one to the rear. From this point on, both the FSM and parts book are confusing. No part number is given for the separate proportioning valve, but it is shown in diagrams.

Could the OP have a combination valve oh his Dart? IMO, yes. Would it be calibrated properly? Who knows. The parts manual confuses things by listing a different A-body Tee at the rear axle for disk and drum brakes. (3420 021 - drum brakes, 3549 947 - disk brakes) Both of the rear Tee s I have on the rear axles are 947s.