E= 1980 decade
0= year, in this case 1980
A=Galaxie
E= service part
8505= cooling part
So, you have a 1980 water pump that was used on a 1980 Ford Galaxie. Most likely that engine was yanked from that Galaxie.
Take your old pump into the parts store and tell them you need a water pump for a 1980 Galaxie, (most llikely a 302 engine) and then compare it to your old one.