I can actually do it right in CAD.
The oil pan flange interior area offers 1.1 quarts per inch of depth.
The billet pan is 1.9" deep on the inside. 1.9x1.1 = 2.09 quarts inside, minus the minor space the baffles take up.
If the stock pan truly holds that much, than a spacer giving an extra quart would be putting the bottom of the pan over 1/2" lower than this one, which would be level or below the cross-member.
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