I've ran the Melling M-68HV pump in my engine for 3 years. Stock oil pickup, pan with a windage tray. I've never had a problem and never once did I ever have to worry about sucking the pan dry. Maybe if it were High Volume and High Pressure, but that's not needed unless you need to move more oil to something like a turbo/blower application.
They do rob some power higher up in the power band. Almost to the tune of 10hp at 6,000rpm. I've heard of it being higher. But that's not a lot to ask for cheap insurance. Before I forget, if you run a HV pump, you MUST run a hardened pump shaft. The stocker will twist like a pretzel.
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