cam question

gentleman

got a cam question here?? got a 72 340 duster with an all stock motor. anyone know what the cam specs ma mopar gave this motor when built (lift,duration) without removal?? im looking to upgrade but not sure on what to get for a good street performer with a little lope to it. (no dragstrip).also were the cam specs different between the first 340's and the last in 73?? i know the compression was but anything else?? thanks for any help.