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.
1912 107-55 NL Pennant (lost to Red Sox 4-3)
C Chief Meyers 4.4
1B Fred Merkle 1.9
2B Larry Doyle 4.35
SS Art Fletcher 3.2
3B Buck Herzog 3.1
LF Beals Becker .65
CF Fred Snodgrass .4
RF Red Murray 1.7
OF Josh Devore .25
IF Tillie Shafer 1.05
C Art Wilson .6
SP Christy Mathewson 7.45
SP Rube Marquard 5.7
SP Jeff Tesreau 4.3
SP Red Ames 1.95
SP Hooks Wiltse 1.7
RP Doc Crandall 1.1-30 years of Giants. Another hundred win NL pennant, another loss in the series, this one was crushing, Snodgrass dropping a game 7 tenth inning fly ball that would have put the club 2 outs from the title.