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What year are you asking about - this post should be moved out of general discussion.
The repair manual is repair-centric and does not show some of the installation details that I think the OP is looking for. It is a good document for restoration.
Just received this diagram of the vacuum release valve. It appears that it mounts to the dash frame, BUT this diagram is for a 68 Cougar. for the 69 Mustang (Shelby), can anyone confirm that this is the correct mounting point for this valve? Thank you.