Ah 1991 what an interesting time.. lots of stuff going on both good (orginalInfinity Gauntlet, orginalCarnage story, ) and bad (NFL Superpro, Darkhawk, Punisher getting plastic surgery to be a black man for 3 issues, Rob Liefeld art, and all the "Collectors Issues" that lead to the bust)
I'm pretty well versed on this time frame, and can offer assistance if needed
Here are scans of the 1991 series of trading cards if you haven't seen it. While not a full roster it has around 90 pre-written bios and group affiliation info, even for a number of more obscure characters and a basic outline of stats.
http://marvel.com/images/gallery/story/1098/images_from_make_mine_marvel_marvel_universe_trading_cards_series_2/image/83570