Well, it sorta was. It holds 6 1/2 quart including filter. They are trying to maximize the sump size within the small A-body K-member opening.
This is a 73-76 K-member of mine at Milodon on their mock up block. They're checking clearance with the prototype SB Milodon Road Race pan. Worse case scenarios: 73-76 K-member, manual, and then power steering.
And then TTI had me check header clearance.
Notice: In 1st pic, the driver side front was changed to a notch on production pans