Which two "Saturday Night Live" alumni swapped lives in the 1983 comedy "Trading Places"?

Two old Quakers, Captain Peleg and Captain Bildad, are part owners of the Pequod in which 1851 novel? Two panels of the Ghent Altarpiece by brothers Jan and Hubert were stolen in 1934. What is their surname? Two puppies rescued from a sinking English brig off Maryland in 1807 are said to be the ancestors of which breed? Two reporters uncover a political scandal that reaches the top in which 1976 film based on their book? Something done very quickly is said to happen in "two shakes of a ___ tail". Which animal? Oliver Hazard Perry reported "We have met the enemy and they are ours" after which 1813 battle? Two Sikh bodyguards assassinated which Indian prime minister on October 31, 1984? Two solid rocket boosters and three main engines launched which NASA craft, including the Atlantis?