My 72 Dart, an A body, had a charcoal canister to absorb fuel vapors. My 65 Cuda, another A body, does not, it has an open vent. I would not expect the 72 to smell, I would not be surprised if the 65 did.
So depending on what A body it actually is and whether or not any emissions devices, if there are any, are hooked up no one can answer your question.