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Can you post a picture? If you are just trying to figure out if it's an FE, that should be easy enough. The mounting bolt circle is quite large compare to a small block.
It is probably one of these.
C5AZ6375K....Engineering # C5AE6380J 12 3/8" Clutch bolt circle
or
C5AZ6375L....Engineering # C5AE6380K 12 7/8" Clutch bolt circle
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