When and why factory used dual snorkel?

MOPARMITCH said

My 70 Cuda 383 4spd had a factory dual snorkel air cleaner.I've seen em on many HP Big Block Mopars above 1970

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My 71 340 Challenger had one also...

I think, pretty much they came with 4 bbls back in those days. 340-383-440 with 4 bbls and dual snorkels...