There was a project on here a while back with a 2.5 mondeo engine which looked mounted but don't know how far he'd got into it.

The mondeo engine is huge though, the Vauxhall v6 is much more compact making it easier to fit but they'll both need a lot of time and effort to do, it's not difficult just very time consuming, if you want something different stick a jap engine in or a clio sport engine