I think that there is a maximum pressure that you want as well, maybe 60-70 psi, even when you are accelerating at high RPM. Too much can be as detrimental as not enough. Jerry Mac shifts his engine at 8200 RPM when racing, so he ought to know what works.
Most people think they need big pressure and volume and opt for the big block style pumps only to find they either pump too much oil into the upper end and oversaturate everything and/or suck the pan dry (if its a regular OEM style pan) and end up with really big problems. All a big pump with volume and pressure increases does is eat up HP trying to spin it while creating other oiling 'overkill' problems.
My 302 gets about 65psi when running over at 3000 rpm or over and idles hot at about 40-45psi and its just a regular volume (albeit higher pressure) Z28-style aftermarket Speed Pro version (which I think means it only has a slightly different pressure spring installed) and I consider it all or more than that or any other similar engine should ever need.
I have read stories where high winding small blocks are drag raced with setups where the engine basically runs out of light grade oil in the pan at the same point it finishes the quarter mile run - essentially ending with 0 psi oil pressure and the engine lives quite well for years. Sounded like a pretty dicey way to run an engine to me, but users assume they are saving horsepower by using as light an oil and as small a volume as possible... Apparently the oil film left is sufficient for a few seconds of low engine speed operation until the oil gathers back in the pan in the shutdown area past the finsih line - but it does demonstrate that not a lot of pressure or volume is required to make a small block live at moderate engine speeds obviously - Randy