If they have year also printed on them they are likely original, they were available for some years after but didn't have the year as spares. Don't toss them, even if no good, good for checking lengths if you wanted to collect your own set or make a set since most sets off the shelf are generic, probably based on a SBC with aftermarket lead brackets for neatness. GM factory lengths weren't known for being that way, if that's what you want to redo them as. Many replacements don't have the little nub that the distributor cap clips over. Doesn't matter, it did nothing, but a detail feature nonetheless.
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