nasc car ducts could be done but as they are basically designed for a flat panel ther will be a lot of filling and shaping to get them to fit a curved panel like an engine lid.
i put one into the front quarter of my bug and it was a lot of work to get the curve exactly matched.
basically i ended up buying one duct then using it as a mould then i made a fiberglass one that i cut and grind into shape.
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