1973 318 hesitation?

I just bought a 73 dart swinger with a 318 2brl carb and auto trans a few days ago and joined this forum a day later. i think you can call my problem hesitation. takes a few minutes to start when cold but immediately when warm. but when accelerating off idle, it appears to bog or hesitate. hard to really explain but ill try. when accelerating, you can hear the rpms increase but car just goes slow. even on the freeway takes a little bit to get up to speed. at first i was hoping the parking brake wasnt engaged. thought maybe it was just because the carb was 2brl. can anybody help me out with this. i would love to not burn through the gas as thats what im fearing. my fuel gauge seems to fluctuate so i have no clue one how much i have. ive looked into that and my temp gauge works.