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what does the center adjuster do ? how is it adjusted ? is it adjusted differently with a 2 carb setup ?

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Those type carbs, same as 1962 and 1963 M.W. carbs, used the big center screw to set the idle RPM No screw on the sides to set the idle rpm All(3) the Carter AFB I've seen that didn't have weighted secondary air doors had the venturi boosters come in from the sides of the carbs, not in from the rear of those carbs. like most of the other carbs do
BTW, for some of you younger guys, you haven't seen all of what some of us older guys have seen, I watched the dinosuars die out