Carter AVS Question?

I have a 1968 Dodge Dart GTS, 383 4-speed. I purchased and rebuilt the correct Carter AVS 4426S carburetor. However, it did not have the dsahpot or the choke vacuum diaphragm.

First, what are their functions?

Second, can the carb/engine operate properly without one or both of these parts?

Any help/education is appreciated.

Thanks,
Al in Maine