Your catcher better not get hurt and he will have to be an iron man. You do not have enough pitching. It is possible you could be c ompetitive for one or two games. Mid 70s pitchers can sometimes win a game with some luck, but they will not draw much interest.
I would either pick up a few players, especially pitchers and another catcher. If that isn't possible, you need to contact Perfect Game ASAP and tell them your situation and that you are not coming. Last minute teams dropping out creates all kind of problems with the tournament schedule.and other issues.