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.
1892 79-83
C Jack Boyle -2.2
1B Buck Ewing 4.15 (40.8) LAST SEASON
2B Eddie Burke 1.35
SS Shorty Fuller .5
3B Denny Lyons 2.55
LF Jim O’Rourke 1.05
CF Harry Lyons -.55
RF Mike Tiernan 3.5
Uti Jack Doyle 1.05
Uti Hardy Richardson .2
OF George Gore 1.95
1B Jack McMahon -.1
2B Charley Bassett -.1
P Amos Rusie 7.3
P Silver King 4
P Ed Crane 0
P Mickey Welch -.15 (40.85) LAST SEASON
-The tenth anniversary team. We lost Keefe the year before, Connor and Ward will both eventually come back but they're currently gone - and 1892 ends the Giants careers of Ewing and Welch, the latter had been on every Giants club in history to that date. Through 2016, they both remain in the top 20 for all time franchise WAR.