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

Ford failed to learn the lesson that big ports don't work & repeated it with the Boss 429 engine. The 429 was built with huge ports to beat the big, bad Hemi. Didn't quite work out that way. Performance in production cars was nothing to write home about & on the track, not much better.
Roger Huntington had this to say about the 429 in American Supercars:
'Big ports made the low end & mid-range weak'.....'The street Boss 429 didn't perform really well anywhere in the speed range'.
'All else being equal, the Street Hemi could get up to 60 mph 1-1.5 seconds quicker' [ than the street Boss ].
On the speedways, the Boss was quicker on the long ccts, but the Hemi was quicker on the shorter ccts.