Power advantage between Ford 351, Mopar 340 and Chevy 350??

Last I checked W2's never came on any factory based SB mopars.
And Cleveland 4bbl engines never came in entry level cars, like Mavericks and Falcons. You had to move up to Mustangs or Torinos. So, there's no valid apples to apples comparison. When you moved up to B and E Bodies, Hemis were available.