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Ford FEs and the original Mopar Hemis are on the opposite ends of the spectrum. The FE (427s included) are dump truck motors. (Nobody get their panties in a wad over this, I love mine) Their OEM heads flow terribly and build great torque but not too much on the top end. It's torque that's the FE's claim to fame. Too big of primaries is the killer of low end torque. The Hemi, on the other hand, is a "top end" machine. It has tremendous flow capacity in their heads. It will benefit well from large primaries.

Having said all that, I wouldn't place much value on what the guy said...