Yes sir, all of the 62 Grand Prix's with 421 motors were Super Duty's and there were only 16 of them.
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Tommy's Toy
1959 Pontiac Catalina 420a / 3 speed manual
1960 Pontiac Ventura 4 speed
1961 Pontiac Catalina 4 speed
1961 Pontiac Ventura 425a / 4 speed
1962 Chevrolet Corvette
1963 Pontiac Catalina 421/4 speed
1964 Pontiac Catalina 2+2 tri power/4 speed
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