Yes it is USA made and the screws are included.
Im not sure if you will be able to pick up on peep sights or not. The valley of the rail sits .278" above the receiver.
As far as I am aware many of the Nova guns were not factory drilled and tapped. That is why we do not call them out in the listing. If your receiver is drilled and tapped, please compare the hole spacing measurements listed out for the mount to the hole spacings on your receiver to confirm fitment. If Optics Planet does not have the hole spacing measurements on their site, they can be found on ours.
The EGW Benelli Super Nova Pump Shotgun Scope Mount includes #8-40 X 3/8 Screws and T-10 Bit.
No, this will not be compatible.
Unless your Nova is drilled and tapped on top of the receiver this will not mount to it. Most Nova mounts are saddle mounts that attach to the side of the receiver instead of the top of the receiver.
We do not offer screws for this mount so you have two real options if you plan on keeping the rail and not return it. You would either need to contact EGW directly to get shortened screws or you would need to shorten the screws by removing material from the bottom. Contacting EGW is the recommended route if you are not confident in shortening the screws.
It will not as the Benelli Nova is not normally drilled and tapped on top of the receiver and that is how the mount gets attached. You would have to get your Nova drilled and tapped to accommodate this rail.