The 440-3 didn't work very well out of the box. Once it was ported the engine made pretty good power. There wasn't a 50 hp difference between ported and unported, more like 15 hp at peak. But it is about more than peak power, the unported intake had a roller coaster power curve while the ported one was nice and smooth. The EGTs smoothed out with the ported intake and the engine sounded better.