Uhhhh, the roof in that green car has already been worked on. The fact it’s red means if it was a vinyl top car and the rest of the paint (green) is original paint, the original colour under the top would have been cream/white. That looks like filler with some red primer that been sprayed on it many years after the car was made. Lead was still used in ‘75 as that’s what mine had.
It’s a ‘74+ based on the front upper seat belt anchors.