Soundkat,
It's very difficult to give a description of restoration colors over the computer. Most suspension components and brake components were either satin black or left the natural color. Now here's the kicker. GM used different shades of black for different components.
My advice is this. If you want a car that looks good and do not care about originality, paint everything the same shade. It'll look clean, and no one will notice.
Painting the undercarriage can get very expensive, very quickly when you add up the cost of sandblasting, priming and all of those different shades of satin black. Remember, this stuff is about $30-$40 per can. You also will need to get the correct shade of inspection paint to put on the ends of the tie rods and other suspension peices. If you still want to go the original route, I suggest that you get a restoration guide like those that we offer on this site. Check "Chevelle Books" on the main page.
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Ted Stojkovski
(formerly Skunkynuggets)
(so add about 300+ posts)
Syracuse NY
Team Chevelle #172