yowza... Not familiar with a v8 smaller than the 3.4 (not that comes to mind quickly, at least) other than exotic car use... I believe ferrari has used a 3.2 v8 if I'm not mistaken... sure it would fit... Here's how I figure... The taurus engine bay is no wider than the mx-6 engine bay, which is barely wider than the MX-3 engine bay...

There would probably be a slight modification to the engine mounts, and a day or two spent doing measurements and calculations to make it fit properly, but it's a very compact motor... you figure that Yamaha specializes in making small motors.... and high performance ones at that... it's going to be a nice one

from what I've read, it's a near-silent motor that is smooth as silk, and engineered like nobody's business

that spells out fun to me
Daniel