http://www.fordpowertrain.com/Headers.htm
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the above pic is for a 66-67 fairlane
at the bottom of the chart, they have a listing for the 78-79 bronco's, and one of the product notes states that they will only work on an auto tranny. will the bronco headers fit better than the fairlane headers? unfortunately there is no pic for the bronco's and the bronco's are try-y and the fairlanes are shorties
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