your title is a bit confusing... I assume we are just talking Fuel pump, and not the raw water pump, correct?
If it is just the fuel pump, Holley makes a nice marine line. The Blue one will suit your needs. The blue comes with the separate FP regulator, so make sure you have a fuel psi gauge to dial it in.
Personally, I REALLY like the electric fuel pump and have no idea why anyone wouldn't have one.