Sim Sim
So sure if you have all the money in the world go and get some hours in a sim, hey if you want to be really ready... get yourself a TR in that plane that will help too.
Again they are looking of how you manage the plane overall and if they put you in a 737 is because they do not have anything cheaper or smaller, I am assuming you are not typed, if you are and they are offering you a PIC position that is a different ball game they will be looking at what you are doing as if you were flying the line tomorrow.