It's the depth of the SS insert. Here is a deep one which is original and desired. The one you show is the later replacement and has a shallow insert.
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67 Camaro RS/SS 396 Original Drivetrain
70 Chevelle SS 396 Convertible Original Drivetrain
70 Chevelle SS 454 LS5 Survivor Original Drivetrain
70 El Camino SS 396 Original Drivetrain
65 Impala 396/425
65 Triumph TR4 Original Family Owned
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