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The car also bogs down on hills if I push the gas pedal way down

If the vent tubes were plugged with a non vented cap that could cause fuel starvation but not a gas smell.If you're SURE everything is tight in the fuel system I'd just chalk it up to trasitory vapors from the carb maybe on a hott(er) day. More info: what eng/carb/pump/lines/pickup. always done it. WOT or part throttle. first thing comes to mind is AP issues & fuel psi at the carb inlet at that point. Are both cars identical for eng/carb etc

live every 24 hour block of time like it's your last day on earth