Sizing photo sequence so eye pupils are in same place

I shot a bunch of faces, all looking straight at the camera. I want to create a slideshow/video that fades from one portrait to the other, but with the eyes in the same spot. What's the most efficient way to individually size and crop them to achieve this?

I'm thinking the pupils would have to be, for example, 500 pixels apart, and the image would have to be moved, and perhaps rotated a bit to put them right in the same spot for every photo.

Thanks for your ideas. I'm a good photographer, and pretty good with routine photoshop work, but this is beyond me right now!