My WAR calculation is a combination of Baseball-reference and Clay Davenport; I believe it to be the "best" WAR number available for historical comparison. 8 WAR is an MVP quality season. The record is pythagorean adjusted for 162 games.
1907 90-72
C Roger Bresnahan 3.05
1B Dan McGann 2.4
2B Larry Doyle -1.1
SS Bill Dahlen 1.05
3B Art Devlin 5
LF Spike Shannon 1.45
CF Cy Seymour 3.65
RF George Browne 0
OF Sammy Strang 2.5
Uti Frank Bowerman .7
2B Tommy Corcoran -.2
1B Jack Hannifin .45
SP Christy Mathewson 7.55
SP Joe McGinnity 1.9
SP Red Ames 1.65
SP Hooks Wiltse 3.15
SP Dummy Taylor 1.25-A quarter century of Giants. Bresnahan starts using shinguards and, following a June beaning in which he's given last rites, a padded mask. Giants are at 90+ wins each of McGraw's five years as full season manager.