I removed the air injection entirely.
The 5.8s in the E250/E350 didn't have it. They ran a idler pulley in place of the pump. That's were I got my pulley and just removed the rest.
There's no
visual inspection during emissions testing here and the old Ford passes just fine without it.
Picture of the pump replacement idler:
Edit: Ken's right, if where you live, they look to see if the factory equipment is in place as part of the inspection then it has to be there.