Torque converter I know its been asked before

I have a 70 Dart with 360, 727 auto, 8 3/4 3.55 rear end posi, its a mild cam, would say around 325 hp. I do not know the engine build specs as weren't not any when I bought it. Some resellers don't keep them things. Got a good lope for cruise nights. Driven on street no strip but want to get some more get up and go down low. Has what appears to be stock converter and stall. What stall and any particular brand or builder you would recommend