Rockman, detatch the shroud from the radiator, then remove. This will give you enough room to work. Get it out of the way.
After you re-install the waterpump, put the shroud back in place but, do not re attach to rad. Just let it sit there, then re-install the waterpump pulley and fan. Just push the shroud toward the engine to give yourself some room to work. After this, re attach the shroud to the rad.
You get it?
I'm a hobbyist. Not a professional. Don't be hatin'!