So what’s the deal? Which carb is the right one?

MoBros and MoSis':
I'm rebuilding the slant six engine in my October of 1973 build date 1974 Duster 225 auto federal emissions non-a/c car. I have two carbs and am not sure which one is correct for my car. I've heard that both are correct, but I'm not sure and I could use your advice. The first three photos below are of what I believe is the correct carb for my car: a Holley 1945. This carb is the one shown in the fuel section of my FSM. Note the part number and date coding in the second...

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Author: Cruiser