New torque converter?? (and cam question)

I wouldn't use a TCI Breakaway. Won't be much better than stock. TCI doesn't have the best reputation anyway. A ten inch from a reputable company, around 3000 to 3500 stall, would probably be well suited for a XE274. Don't underestimate your converter needs. IMO, seems like a lot of people try to run too much cam for their stall speed. If you are only wanting a converter in the 2200-2300 range, it would probably be better to stick with the 268 cam you already have.