i don't have a picture of the block but i don't see how you could change where it vents unless you gutted the inside of a pump (so the gear spins but doesn't actually make a vacuum) and mount an external aftermarket pump. There's also not a whole lot of room where the pump is mounted to really do anything.
Block is upside down in this picture FYI. The vacuum pump is the one on the left (labeled Bosch) and the oil pump is on the right (labelled VM)
http://i650.photobucket.com/albums/uu22 ... CF1792.jpg - Credit is due, not my pic