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The year of car was not given but seems like you have a 65,66, or 67 Olds....therefore headers cannot be bought for your car. The best you can do is factory dual exhaust manifolds and a dual exhaust system. It will help HP greatly. The left side manifold you need is often sold on Ebay. It is being reproduced. The passenger side manifold remains and the center crossover hole plugged.
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