Pretty sure the hinges, bolts and jambs were painted after the doors were hung. Of course I'm usually wrong so they probably need to be black.
Seriously, the hinges were body color, I doubt they painted the hinges then mounted them, too much time and effort for a cheap car. I have not seen a Chevelle with phosphate bolts on the hinges. Of course it's not something I focus on when looking at a car. I'm sure someone will be able to answer for sure.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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