Looking through an original GM Parts Division chassis and body parts catalog, effective 1979, 1970 was the only year that is shown to have the "4 wheel drive" emblem. The "4 wheel drive" emblem has the same mounting holes as the "8/350" emblem under the front marker light on the front fenders. Because your truck is a 71' it should have the "8/350" emblem instead of having the "4 wheel drive" emblem. Hope this helped.
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