If you google marks 4wd adaptors you will find whart is now becoming a more common replacement using  fuel

injected extremely late model engines hooked to their original gearboxes.

http://www.marks4wd.com/bell-housing-adaptors/nissan/patrol.html

A transfer case adaptor is then used so that the 4wd capability is maintained.

Nissan and GM are preferred over the older Ford v8 engines. As petrol evolves older carbied engines are becoming

less capable to accomodate octane and raw product changes.

http://www.marks4wd.com/bell-housing-adaptors/nissan/patrol.html

ls3 conversion on the dyno below ..390 odd hp

http://www.youtube.com/watch?v=p5FxGOQUZ9Q