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

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.
This is an excellent point. The Cleveland is a TIGHT fit in Falcons and Mavericks. They'll fit, but it's a *****.