4/7 swap in firing order..

whats the advantage of the 4/7 swap in the firing order? is the advantage in the fuel distribution into cylinder #2? in the conventional firing order #5 and #7 pull fuel to the back of the engine and then #2 pulls to the front at the opposite end and gets lean. i was always under the assumption thats what dual plane (LD340 for eg) intakes were for. and staggered jetting usually solves anymore leaning out problems for that. i can see how the #2 going lean be a problem with a single plane intake and possibley the need for the 4/7 swap. what am i missing here? or is that swap just for a high rpm/ single plane/ tunnel ram kinda thing?