Unfortunately the '68s don't have the option letter codes that the '67s had, and also don't have the Z/X codes they used in '69. So '68 cowl tag won't tell you if it's a Z/28.
They also should have the very-hard-to-find "DF" 15 X 6 Rally wheels and disc brake option. In '67 and '68 only the Z/28s came from the factory on 15 inch wheels. Should also have the 3/8" fuel line as well I believe.
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