You may be interested in the Translated Stats that Baseball Prospectus has that basically tries to translate baseball stats througout history so that they can be compared next to each other. These stats also have park factor adjustments.
Some examples:
Code:
AB H 2B 3B HR BB SO BA OBP SLG
Ryan Howard '06 581 182 25 1 58 108 181 .313 .425 .659
Translated 559 172 26 1 56 105 163 .308 .424 .658
Babe Ruth '27 540 192 29 8 60 137 89 .356 .486 .772
Translated 554 187 27 1 78 137 183 .338 .469 .812
Vinny Castilla '98 645 206 28 4 46 40 89 .319 .362 .589
Translated 636 175 27 4 41 38 82 .275 .322 .524
You can look up any player at
www.baseballprospectus.com