oil pump priming
Get you a quarter inch drive, deep well socket that will fit your oil pump shaft and weld it to an extention, then use a speed wrench to prime your oil system. The advantage of this is you will actually be able to feel your pump get suction and you can tell if it might be cavitating and losing prime while pumping. Five minutes is plenty of time to completely prime your engine. if you have a mechanical gauge on your engine, I recommend having someone watch the gauge while you turn the pump so you will get an idea of what kind of pressures you will have at idle.