Runner length vs cross sectional area will have a significant effect on engine torque tuning.
SStrokerAce is correct in saying that runner length will move the powerband up or down, depending on length. The following is only an indicator of manifolding trends.
Long skinney runners = low speed torque. Short fat runners = high rpm torque. Long fat runners = mid to upper rpm torque. Short skinney runners = mid range torque. Long large runners without bends = difficult to make with a common plenum and throttle body.
FWIW bends in the intake runner will almost always cause a loss in flow and that will usually result in some loss of high speed torque (horsepower). The LS6 intake does an excellent job of bridging the gap between low speed and high speed torque.
Remember, GM developed the LS6 intake as a way of tuning more horsepower without a significant loss of low end torque. Most will agree they did a pretty good job.