[0] https://store.steampowered.com/bundle/6588/Monkey_Island_Col...
[1] https://www.gog.com/game/the_secret_of_monkey_island_special...
[1] https://www.gog.com/game/monkey_island_2_special_edition_lec...
My understanding is that someone backported the speech from the remastered version into the original game. So you can play the original MI1 in SCUMMVM, with speech. It's great.
edit: this might be the link https://archive.org/details/MONKEYISLAND_201903
It's a bit hard to describe why, but there's a lot of both dry and surreal lines in the game, and hearing Guybrush deliver them all in the same bemused voice can get a little monotonous, and makes the character come across differently from just reading them.
It's technically piracy, so buy the originals at GOG so you don't feel too guilty.
Great games, and this is the best way to play them.
The game runs in DOS. DOSbox should be fine...