If they're big enough, (we call them cutters) filet them for two pieces and then the head works good as well.
If they are smaller (we call them hookers), up through the nose out the top of the head.
Really big ones, filet them and cut into manageable pieces.
For drifting, filet a hooker from the tail up on each side, but not all the way. Stop just before you would cut it off the body. Those pieces flutter as you drift and big Blues can't resist that. Kinda like Catfish Candy.....