I have never had that combination before. I am not syre those would go together. Are you doing a stacked cake? I would probably do 1 tier chocolate and then the next tier spice. Maybe someone else has tried it! Let us know how it tastes!
I don't think it'd be bad together.. I actually think it'd taste pretty darn good lol .. like lisa said, cinnamon and hot chocolate go well together so I don't see why spice and chocolate wouldn't .. let us know how it turns out if you decide to do it