shortstuff

I found a 53 olds deluxe 88 in a garage for twenty years and bought it from a guy who was always going to finish it and never did. I now have the car running and driving and would like to fix some problems. Someone had blocked off the fuel pump and installed an electric fuel pump. The original fuel pump is a dual action and i bought one off e-bay but i am not sure if it is the right one. The casting number on the side is 4421. I dont have any books on this car. Can someone let me know if this is the right fuel pump or what it does fit?
Thanks