It allows for more air to be forced in evenly.
And pump is for more fuel higher pressure then you can run bigger nozzles on injectors.
Spins the black round things harder
That is a 12ht intake manifold modified, no longer need the heater element or butterfly because I have replaced injector pump with a rotary pump with has a electric stop solenoid. In the pick I just have it bolted to some flat steel so when I welded it kept its shape.