Not Ranked
Wow, where do you start on this one? This is a real apples to kiwi fruit comparison. Single plane vs dual plane. Assuming you're talking carb, a single plane manifold is more suited to higher rpm application for reasons too numerous to list. That being said, a Cobra is a pretty light vehicle so a single plane manifold might not be as detrimental as it would be in a heavier street driven vehicle. A street driven Galaxie for example, would be a dog with a single plane intake.
Now fuel injection is a whole different fruit, and a single plane would work just fine for a port injected application.
phil
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