hmm for the next GTHO they'll need a good engine. From the Ford network worldwide, they don't have a good enough engine to fulfil the legend. If they do bring it out, the only engine i can think they'll use is the new Shelby Mustangs supercharged 5.4L, personally i think thats a stupid idea, i say leave it a naturally aspirated BIG V8.
If Ford US ever made a working version of that 427 V10 engine, i say to get rid of 2 cylinders and make it a DOHC 5.6L V8, good for about (im assuming the bore and stroke of this engine is different to the current triton/boss engines, meaning higher revs) at least 350kw, or you could just say it's wishful thinking