In the NWP - EE progressive contrarian started, our best Jesuits squad went 127-35, and then 8-1 in the playoffs to win the world series. (16-team league) 1273 runs, 732 RA - that +541 run differential can't match contrarian's but it's close.
It was dual era - 1894/1959 seasons.
Offense led by:
Billy Hamilton (.394/.504/.490, 270 hits, 192 runs, 20 + plays in corner outfiled)
Willie Mays (.331/.383/.640, 40/46 steals, 166 Rs, 192 RBIs, 227 hits, 50 HRs)
Ernie Banks (.318/.376/.530, 37 HRs, 201 RBIs, 16 + plays at SS)
Pitching led by:
Amos Rusie (53-9 in 81 starts - a league win record that of course will never be broken)
Don Mossi (3.70 ERA, 42-3 by pitching 81 games of relief as part of a tandem pairing)
Obviously a stacked team, but in 26 seasons, the Jesuits have:
-22 100-win teams, only 1 team with less than 96 wins, and never a losing record
-23 division titles
-13 pennants
-8 world series
So this league has been a special run....