Pretty sure Duspan is referring to the still currently available aluminum intakes from Mopar Performance...like the M1 single planes for small or big blocks, which are spread bore pattern.

Not sure why they do it. No one runs a spread bore in a performance application unless they have to for class reasons. There are a few Thermoquad loyalists, but they are few and far between. There's no performance benefit from it, just makes it easier to bolt on and run a POS carb. Mopar Performance has sold crap for a long time and been pretty disassociated w/ what Mopar racers need and want.