Why did ANA have Wright Cyclones in their DC-3s? Because Ivan Holyman bought a hangar full of them from the Yanks towards the end of the Second World War and converted the whole fleet. (The surviving VH-ABR case in point.)
Incidentally, Ivan was, from various accounts, at times a silly old git. Too stingy, he refused to fit wipers on the RH windscreen causing the pilots to threaten a stoppage. Another time he issued an ops memo to all aircrew saying he would not tolerate the use of obscene shorthand in maintenance logs. (Thought U/S stood in pilot parlance for up the ****!) Source: "Outback Airman" by Harry Purvis. Harry was one of Holyman's prewar pilots and a founder of the union that preceded the AFAP.