[bobcowan]

Yes, they are a little "loose" when installed. You will be able to rotate them, and move them around a little bit. As long as the two o-rings are fully seated, it won't leak.

The angle of the injector is kinda important. You want the injector to point directly at the intake valve. If it's too far off line, you'll be squirting fuel onto the walls of the port. And that's a bad thing.