RETAILING

Grace Sells Del Taco Units in Southeast: W. R. Grace & Co. said it is selling about 100 of its Del Taco and Taco Villa eateries in the southeastern United States to Taco Bell. The Grace-owned Del Taco outlets were not affiliated with Southern California’s Del Taco chain of Mexican-style restaurants. Grace, a conglomerate based in Boca Raton, Fla., said it was selling the fast-food division as part of an effort to concentrate on core businesses such as chemicals and health care.