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All those racers over the years didn't have access to the single plane and modern intakes we have today. It's not that they had it wrong, it's just that that's all they had. Also depends on the rules that are applied. Some have to use "period correct" intake manifolds.
As for the pulley, the dyno videos show something that has run-out. There is no belt in those videos as they are not turning the water pump. As the rpms go up, the oscillations stop, but as soon as the rpms come back to idle range, you can see it again.
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