I'm not too sure what the oem mopar proportioning valve unit even looks like. Is it something like the one I attached in the pic? I'll post on fbbo to see if I can find a used oem or NOS PV. Thanks guys
this is for drum brakes and just has the brake safety switch in it. if you already have the newer style prop valve in there, it might be easier to buy a GM style one (what chrysler switched to in the mid 70's) than to try plumb in a '69-74 style one