Carb size ?

I have that 74 plymouth gold duster in the pic. It has 3,906.3 miles on it . It was my great grand mas, I sold it when I was 16 . Then found it and bought it back its been setting 14 years and I put a batterie an ignition module on it runs great . Just bought a clifford intake and a set of Aussie headers for $350 going to buy valves ,cam and have the block and head milled. just needing help on what all to buy so far intake and headers was a great deal just asking what I can to get help with my build. It is a very strait car, great interior needs a vinal top and that's it besides the engine build I thank all of u for all the help it is needed.