The pan in the picture above is the 69-72 396-454 Camaro Chevelle Nova style oil pan with the stair step levels to clear the subframe.
Some backyard mechanic welded on a deeper base. GM did not sell crap like that with a welded seam and sell it as a special 6 qt oil pan
The below pic shows the correct sytle pan used on BB Corvettes - This is a service replacement pan but still shows the type of oil pan used on BB Corvettes
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