they classified the cars by weight/horsepower so the car can go up or down a class depending on the weight and the NHRA-factored horsepower changed over the years so you will see them running in different classes
looking at old pictures for examples ,
the 1967 Jenkin's L78 Camaro ran in SS/C
the Strickler 1968 Z/28 ran in SS/E or SS/F
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