Distribution Block (Combination Valve) – 1971/72
This is the correct Combination Valve for 1971 & 1972 Cars with Front Disc Brakes & Rear Drums.
Source – Inline Tube
Note: There is a special took that makes Bleeding your Brakes MUCH easier and should be used with this particular Combination Valve.
You can see it here > https://www.stage1restoration.com/product/brake-proportioning-valve-bleeder-tool/