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Hi and Welcome,
A 455 was not exclusive to the 442. The Cutlass Supreme Coupe was only offered with one body style, the Notch Back Roof. The 442 and Cutlass S came with the fast back roof. The trip plate on the firewall will tell you if the car is a 442, Cutlass S or a Cutlass Supreme.
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1966 Ninety Eight Convertible - 425 Tri-Carb, Factory Dual Exh, Switch-Pitch THM400, 3.54 Posi.
1966 Catalina Wagon - 421 Tri-Power, M21, 4.11 Saf-T-Trac, 8 Bolt Wheels
1989 IROC-Z - 5.7TPI
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