Islamic Revolutionary Guards stormed a hide-out of antigovernment leftists yesterday and three guerillas were dead after six hours of gunfire, Iran's Pars News Agency reported.

The state-run news agency also reported the firing squad executions of 10 more persons and the naming of a "dedicated" Moslem as foreign minister.

Pars said two of the three dead leftists blew themselves up with a hand grenade. Three persons escaped, two were captured and one Revolutionary Guard was wounded, Pars said. It said the guerillas were members of the Mujaheddin-e-Khalq.

Iran's Moslem clergy-dominated government blamed the Mujaheddin, which mixes Marxism with Islamic tenets, and the Marxist-Leninist Fedayan for violence following the ouster last month of president Abol Hassan Bani-Sadr. They were also accused of last week's bombing deaths of Islamic Republican Party leader Ayatollah Mohammed Beheshti and 71 party officials.

The Iranian national assembly approved the appointment of Mir Hossein Mousavi as the country's foreign minister by a vote of 126 to 8, with 33 abstentions. Mousavi, who also runs the newspaper Islamic Republic, said Iran's foreign policy would be "neither East nor West" and would respond to "the hope raised by the Islamic revolution in the hearts of the deprived throughout the world."