Ah ha --- Well then -- the Dual plane should build better torque at lower RPM's than the Single plane. The single plane will make more HP by virtue of allowing the motor to breath a little more air at higher RPM's... where the Dual plane may run out of air up there. But you'll like driving the Dual plane more.
The specs on the SB383 were given at 6,000 RPMS --- and a decent dual plane manifold is capable of delivering enough air to get there.
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