They became part of the SS package on the 70 SS. Early 70 SS did not include the hood pins. Later they were standard on the SS and remained that way through 72. You still need the hood latch, the pins were kind of a safety thing when racing. They would keep the hood down if the latch failed. In reality I think they just added them because they looked cool.
Without the latch the hood would be jumping up and down against the pins.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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