Installed the lower radiator hose and the upper radiator hose assembly. The upper assembly has a filler neck installed as it is the highest point in the system--this is a must in order to get all of the air out.
I filled it with 4 gallons of fluid (a 50/50 mix of water and low-toxicity anti freeze--I'm a pet owner and regular anti freeze is incredibly toxic to animals even in low doses) but will need to add more fluid after starting it. I didn't realize it would hold that much!
The radiator cap I got for the top filler didn't fit. Always something.