The Mecum description is misleading. We all know the 427 didn't replace the 396 but was an available option.
OR, the Chevrolet dealer replaced the 396 with the 427. It states this car is 1 of 1859 made with the L72, but no obvious paperwork to back that up... 
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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