Oil Pump

As far as a HV pump sucking the pan dry, well that is a possibility in some situations. How is it possible you ask? Well have a look at the GPM .
Stock 4.9
HV or HP 6.2
That's a 26.5 percent increase
As you increase the pressure, which HV pumps do, you also increase the GPM. More pressure squeezes more oil past all the little restrictions in the engine.
That extra oil has to make it's way back to the pickup.
So if your running close to oil starvation, with a stock pump, then going to a HV may just create an issue.
That's something to think about.