Pump manufacture specs are under ideal conditions (a selling item), like shortest inlet and outlet hose length besides minimum head pressures to reach their numbers. To be sure take those manufacture spec numbers and cut them in half. This to allow for IC fluid and hose resistance, lengths and head. If you can live with that you should have the right pump for the job. Overpowered just throttle back, underpowered you just made a manufacture more money. JMO's as I have worked on many well pump systems over the years where water is pushed thru long runs, pipe resistance, diameter, length, pressure (head) and volume all play into this. Know what you want out of a pump before purchasing no matter how cheap or good of a deal it is.