oilpan capacity

Curious as to the reason for the custom pan. I "think" I have an idea that it's due to ground clearance of the standard Miloden deep pan and either cost or width of the Road Race version? I am seriously considering one that looks like yours for my E-body to keep it low profile with the added capacity.

This engine was in my AAR and the car was lowered so yea ground clearance for sure, the pan had a expanded metal windage tray and trap door the pick up was 1/2" pipe straight down from the bottom of the pump. I never had a oiling problem and the motor seen 7600 RPM a lot.