I'm not the most educated on this, but I would expect the following:
1) The motor mounts would probably be close to matching up, but even if they don't, new motor mounts can be welded on or existing ones moved. You'll have quite a few engine options anyway so finding one that matches should be too difficult
2) I think the trans is going to be the largest issue. From what I've read, most of the trans that came with the 4 cyl's can't handle the torque created by the 6 cyl's, but I'm sure someone will have more accurate info.
Start here with Novak's conversion site and I'm sure you'll find some very useful info.
http://www.novak-adapt.com/index.htm
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