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Dan,
I forgot that you have the under car exhaust. It does look tight there with the carbs. If you cannot find a way to plumb a line to the carb, and you want to minimize that smell and allow for proper breathing, you might want to consider running a vent line from each valve cover to a catch can on the fire wall like the old race cars had. Just make sure that the catch can can breathe. With my catch can I do not recall smelling any vapors under the hood.
It seems like I have seen some vehicles run the PVC to the intake manifold as well, but I could be wrong.
Jim
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