A Few Fuel Pump Questions Before Installation

Hey guys,
I have some questions for you all about the Carter Fuel Pump before I go ahead and install it.
1) Should the lever on one side of the pump move? Cause mine moves maybe 1/2 of a millimeter total with small force applied to it (I did not want to break it, just see if it moves).
2) Is there any prep work that needs to be done on the fuel pump before it is installed, or does it just bolt in?
3) Any key tips that I should keep in mind?
As always, thanks for your help!
77newyorker440