When creating a new Integration Services Project in Visual Studio 2013 I can select the .NET framework to target. How can I see what .NET framework is being targeted on an existing project and potentially change it?
You need to open one of the Script Tasks and click the "Edit script..." button. This will open the script on a new instance of Visual Studio with the script in its own project. There you can change the properties of that project to modify the targeted framework for that particular Script Task.