Scroll down on these links for pics.

http://67-72chevytrucks.com/vboard/showthread.php?t=325736

http://67-72chevytrucks.com/vboard/showthread.php?t=679156

My 1960 GMC. Which was sold. Zoom up to see the shape. If I still had it I would measure and make a drawing. This will get you started til others reply.
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Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn