I am going to attach a page from the 1970 Pontiac factory service manual. I don't have 71 or 72 factory manuals. I jump from 70 to 73. Not sure if 70-72 use the same set-up. You can see the 70 TA has a separate switch mounted on the carburetor to operate the flap solenoids. Maybe this will help.
The file is too large to post. If you think this will help, PM me and I will be happy to e-mail it too you.
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