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The hemi head has (I'm guessing) probably more than twice the oil coated surface area for oil to collect up top and drainback to the sump is far more of an issue, so it's logical that the more oil that is (for want of a better word) "dwelling" on an engine surface and not draining immediately to the pan has to be made up for in the system volume.
A competitive AH car will have 3 qt’s of oil in the pan and 2-3 in the sump. Running over 9000rpms driving a very low back work pump with no bypass fed by a single external line.
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