Yes and No, how's that? Really it won't hurt a thing especially if you are
towing or in a perf application. Volume is the key, not pressure. 10 psi for
every 1000 rpm. Disadvantage is it takes more power to turn the pump,not
much but some. Also puts more load on the cam gear that drives the pump.
Would I do it? Yes! Hope this helps......

You're going to get a lot of opinions on this.  IMHO, the HV
- not high pressure - is the way to go.  My thoughts are to
maintain the pressure at a constant level over a broad RPM
range.  The extra volume can do this.  If you also use
higher than stock maximum pressure without other lube system
mods, you can have too much oil in suspension in the upper
end of the engine resulting in a dry pan and reduced
pressure.  I have never seen this happen with a high volume
pump at stock maximum pressure other than in our dirt track
engines above 8000 RPM a few years back.  It seemed the oil
foamed and would not drain back.  Removing the oil filler
cap revealed an engine filled with whipped cream.  It was
not pump related.  We first suspected the pump but, had the
same problem after swapping to a stock pump.  The problem
was resolved by kissing off the sponsorship of the local QS
Racing Oil dealer and going back to our old oil.

As another poster indicated, a HV pump will require a bit
more power to drive.  I think this is probably negligeable.
Maybe someone here like Dave Baker would have a better
handle on that based on dyno testing.  Even though I
generally an HV pump when I build an engine, I strongly
suggest you think about your oil choice.  An oil that is too
heavy will take a bit longer to fill the lube system and
bring it to full pressure.  IMHO, a 5w or 10w-30 oil is
plenty in most parts of the US.  Unless you are in a
constantly hot environment, I would not use a 10w-40 grade
oil in an engine in good condition with no oil consumption
problems - notice I did not say "issues".  Colder climates
may call for a lighter grade oil.  All that said, you should
use the manufactures recommendation on oil unless you have
good reason not to even with a rebuilt engine with a
different oil pump.  The design  of the engine lube system
can greatly influence the oil selection.

Good luck
Lugnut

It depends a lot on the engine and on the intended application. If its
an engine design with a weak oiling system or inherently poor oil
distribution, then the HV pump helps. If you're running full-grooved
bearings or loose bearing clearances, its almost a necessity. Just be
sure to use a hardened pump drive shaft (in applications that use a
shaft). The load of an HV pump can twist off a cheap drive shaft.