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.
1937 NL Champions (lose to Yanks 4-2) 95-67
C Harry Danning 2.25
1B Johnny McCarthy .65
2B Burgess Whitehead 3.5
SS Dick Bartell 6.85
3B Lou Chiozza -1.7
LF Jo Jo Moore 2.3
CF Jimmy Ripple 1.1
RF Mel Ott 5.85
C Gus Mancuso 1.65
OF Wally Berger 1.65
OF Sam Leslie 1.15
OF Hank Leiber .45
SP Carl Hubbell 4.05
SP Cliff Melton 4.75
SP Hal Schumacher 2.35
SP Harry Gumbert 2.1
SP Slick Castleman 1.65
-The Giants spend some of spring training in Cuba, win another pennant, lose to the Yanks again. Terry's over 90+ pythagorean wins in each of his five seasons as manager, the Giants don't lose anything in the transition from McGraw. Ott moves by Connor as the top Giants position player by WAR ever and Hubbell is now the second greatest Giants pitcher. Freddie Fitzsimmons finishes his Giant run and spends the rest of his career as a Dodger.