Not sure about America, but in Canada, I was told by some dealership (a Subaru Dealership as I was trying to import a WRX engine for winter kicks) that it's not possible to import a whole and new engine. However, you could import a USED engine and have the engine taken apart into 3 or more pieces and consider those as parts.
Not sure if you wanna do that to the heart and soul of an automobile though....
Not sure if you wanna do that to the heart and soul of an automobile though....