I found this on a Corvette forum. Hope it helps.
It's a big block fan & clutch, but not for a Corvette. This is what Joe Lucia (heap big Corvette parts authority) says about that fan on the NCRS site:
"The GM #3931002 fan blade assembly was never used on a Corvette. It is a 7 blade fan originally used on 1968 full size Chevrolet passenger cars with air conditioning and 396 or 427 engines. It was also used on some full size Buicks and Cadillacs of the period. GM #3931002 was discontinued from SERVICE in October, 1986."
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