In the world of race cars.The theory goes:the longer the runner,the more lower end torque you'll get.And the shorter the runner usually means more upper end power.
I would assume that to be true with velocity stacks.but our injectors are close to the valves.
With the runner(vel. stack) being longer it has more time to atomize the air/fuel mixture.Which will give you a quicker and bigger explosion in the cylinder.
With the shorter runner(stack).it has less time to atomize.
If I'm wrong.I stand corrected.
just my .02