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No.
The 71 pan is a Mark IV part which has a two piece rear main seal.
The 91 big block is a Gen V which has a one piece rear main.
The oil pans are not interchangeable.
 

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Discussion Starter #3
Swapping a 91 454 out of a motorhome in my 71 nova....anyone know if the oil pan will fit or have to be changed
 

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There is an aftermarket pan that will allow the later engine to be installed, I have one on a Gen 6 454 in my 72 Chevelle. It was purchased at Summit Racing but I do not remember the part number.
 
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