The "350HP" is the next step up the ladder to more performance out of your 4.0 based Jeep/AMC motor. This combo features a more aggressive cam profile to give that "Lopey/Rowdy" idle
Genuine Mopar Performance 6.2L Supercharged Crate HEMI Engine - 68303089AC | All Mopar Parts
4.0-Liter Straight-Six Jeep Engine With 400 HP - Dyno Video