Could be, and the odds are that it is. Not many L78 optioned non-GTO '72 LeMans were built.
Just a "heads" up though, casting #46 cylinder heads are incorrect. Should be "7K3" cast heads on a '72 400 4V. The 46 casting cylinder head was used in 1969 on certain 400 and 428 engines, as well as several 1973 and 1974 350 engines.
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Regards,
"455HO" Lloyd
2008 GMC Sierra Denali 2WD Crew, L92 6L80E, Silver w/ Ebony guts, 14.26 @ 98
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