This is what a 72-74 DISC BRAKE PROPORTIONING VALVE LOOKS LIKE. It is a all one piece proportioning/distribution valve.



On the right is what you have now...drum brake distribution valve.


On the left is a 70-71 disc brake proportioning valve with a metering valve attached. It is the setup in the lower picture Dayclona posted.

The correct power disc brake master cyl.



JT4406, that is a absolutely beautiful car. It has the early 1970 proportioning valve and uses the two piece rear line as his pictures show.