Are the V-8 and IL-6 covers interchangeable?
I'm not 100% sure but do not believe they interchange due to different bellhousings on 216/235/261 and the V8 and later sixes. A study of the later Master Parts List books might help in determining if the same part number carries across from 216/235/261 to later engines.
I've also met similar looking pans with different (and incompatible) profiles on the joint line between upper and lower segments.
