Hey all, been a long time since I visited this board

I'm getting back into building my 62 wagon with front disc's.
not. But what I'm looking for is info on the Ford master cylinder
with a built in proportioning valve. Does anyone know about these.
I've taken MC from the junk yard with proportioning valves but
they just look ugly. I have one setup installed and I'm just making
up new front brake lines for the setup.
but if have have some helpful info I'd like to hear about it.
best
Dave