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Dan,
I had a similar problem with my (1) Holly 650 on my 302, the garage would smell like gas for a few days after parking the car.
Turned out to be the needle and seat in the float bowl was not sealing. There was a small sliver of what looked like glue or epoxy that deposited itself onto the tip of the rubber needle and allowing gas to drip into the carb and into the intake manifold.
Hard to say if you have the same issue, but it’s something to look at. Also, check your fuel pressure, are you running a mechanical pump or an electric fuel pump?
Good luck in finding the problem, keep us posted.
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