Flowtech makes a set of big block headers that are designed for a 4x4 truck in our years. They are listed around $170 and are (if I remember correctly) 1 and 3/4 inch diameter. They are the full length type however, but from what I was told by a speedshop that I spoke with about them "They fit beautifully" and "Do not interfere with anything"... I would take that with a grain of salt of course...
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