The bed's were originally body color so that would look natural but as mentioned if it's not the same shade of red that wouldn't be good. I do have a friend that had his pickup bed coated instead of a bedliner, they matched the body color exactly.
Black is probably safer and it would be a nice contrast.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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