I found a hack of Super Mario Bros. 2 - The Lost Levels, that converts the FDS rom to a NES rom (using the MMC3 mapper chip). I believe it's supposed to be the most 1:1 of all the NES ports of the game (there are some other bootlegs out there that are not as good). For the sake of video game preservation, I hope this rom can be preserved on this site because the website that originally hosted this rom seems to be gone and I believe other modders used this as a base rom for their mods, so their romhacks would stop working if this game was lost. The author of the hack is "Loopy." The link is here - just click on "SMB2J" -
https://web.archive.org/web/20130904235452/http://home.comcast.net/~olimar/NES/
https://web.archive.org/web/20130904235452/http://home.comcast.net/~olimar/NES/