Power Disc Brakes Proportioning Valve

My 1970 dodge dart swingers proportioning valve started leaking and my brake pedal almost went to the floor! I took it to an auto repair shop and they say the proportioning valve I have on their now is incorrect. They are ordering a proportioning valve and new brake lines and say the cost will be $800! They want to redo the brake lines and put in a new proportioning valve.

Can anyone give me a link for the proper proportioning valve for a power front disc and rear drum 1970 dodge dart swinger? Classic Industries part:

http://www.classicindustries.com/product/mopar/a-body-dart-1963-76/parts/md2268.html

Is this correct? I would like to keep my brake lines.

Thank you!

I don't think it matters if the car is power vs manual. All the prop valve does is limit the fluid to the rear drums to prevent lockup.

Power comes from the booster. So to answer your question, that one looks correct to me.