Hope this doesn't get to far off subject as the discussion is primarily 1964. But attached are two pictures from a 1965 sales brochure. As you can tell from the captions one picture is suppposed to be GTO the the other big car as referenced by HP and CI. But I can't say they didn't use the same engine for both pictures. As John V. points out you can't always trust the press/advertising people.
But notice that the tube is on the center carb not the rear as per the post from Tom Vaught. Maybe the factory learned their lesson after these pictures were taken and they had stuffed a test car against a track retaining wall.
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