That opg part looks a lot like one that War eagle posted in the 64-65 GTO forum. I don't think he was totally happy with it. Maybe others are around but I haven't found many.
lilabner you will soon have me convinced the over the valve cover routing is correct for 61-62. I really don't like that much unsupported length but if that's what they did I guess it's right. But maybe it didn't work well and the later years got an "improvement".
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