Specifically "A SVO 2.3 LITER TURBO ENGINE?" Probably be pretty hard. Do you need the ECU, harness etc? Most people here have sourced their 2.3 turbo motors from 83-88 Turbo Coupes. A few from Murkur's but they are as rare, if not rarer than a SVO. Even the Turbo Coupes (the most likely to find) are no longer readily available. I'm outside L.A a with the large source of cars at Pick Your Part I still have only seen one in the past three years. Sorry for the bad news. Not saying you won't find one but they will probably be hard to find.
BTW, the only difference with the 2.3 Turbo and a regular 2.3 are the pistons (forged and altered for lower compression) - and an oil drain back hole in the block for the turbo.