70's had shoulder belts. There was a strap that clipped up above the door windows and a 2nd buckle, mounted where the lap belt buckle is. Pretty sure there was an issue with them, deemed unsafe, and most have removed the shoulder belt. There are retro 3 point systems, one of the things on my long list of things to do.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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