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Longer runners should not matter with a SC. As a matter of fact shorter runners should work better because the air comes from the SC in pulses. The magnitude of the pulses are determined by the volume of the blower in relation to the volume of the intake manifold. Therefore a bigger manifold will have smaller pulses.
Those pulses don't really matter that much at higher RPM but at lower RPM they force the engine to breathe when the cams are not really into their efficient zone yet.
However if your cams have a large overlap (they shouldn't) it will make the blow through during overlap much worse. Just one more reason why SC engines like small overlap cams.
In my opinion, the differences between the two intake manifolds has a much bigger effect on fuel distribution than air flow.
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