I don't know when I look at those old dual planes I look at them as a product of limitations keeping a long runner package at a height where the carb pad was low enough to fit under a factory sedan without a huge hood to fit the air cleaner. Those runners are cramped and exposed to heat soak. I shouldn't make it sound as though a long runner intake is bad, its not, just the package most "Carbureted" dual planes come in seems opposed to anything relating to performance. When I look at the long runner EFI intakes its a different story, they usually involve the 302's lower deck height, affording a completely different upper manifold. This in turn offered more flexibility to arrange the port and the entry into the head with a longer runner.
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