I don't know to what extent my moral philosophy affects my behavior vs. being rationalization of what I would want to want anyway. Ignoring existential despair (I think I've gotten that out of my system, hopefully permanently) I would probably act a little more selfish, although the apparently rational thing for me to do given even total selfishness and no empathy (at least with a low discount rate and maybe a liberal definition of "self") is not very different from the apparently rational thing given my current morality.