A new addition to Boston dining has arrived: A Taco Bell in Downtown Crossing opened Friday at noon. The fast food chain, home to delicacies such as the Toasted Cheddar Chalupa and the Crunchwrap Supreme, opened its doors at 74 Summer St. — just in time for lunch Friday. Ozy Guzman, 25, of Quincy and Christina Ciarmataro, 26, of Brockton work down the street at Uno Due Go. They said they ran over as soon as they heard the new Taco Bell was up and running. “Since they announced that this place is opening, I’ve been waiting anxiously just to come down and buy something, so it’s really exciting to hear that it finally just opened,” Guzman said. “I just ran out of the store and was like, ‘Hey Christina, let’s go get tacos.’ ” “Now we can, on our lunch breaks, run over here and get something different,” Ciarmataro said. Jason Masterson, 40, of Waltham works in IT consulting in the area. He said he was excited to have a Taco Bell in easy proximity to his work and his clients. “There’s a lot of Mexican places, but there’s not a lot that’s grab and go, super quick, so it’s good,” he said. Maria Lovato can be reached at [email protected] Follow her on Twitter @maria_lovato99.