I've not been around here for that long but I've not heard of putting a VW engine in a series Land Rover before.
A quick search on the interweb yielded this =>
http://www.landroversonly.com/forums/f8/d24t-swap-54979/
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Most people will rattle on at you about just using more modern Land Rover diesel engines instead of "going foreign". (Despite some historical links that some perhaps might not want to credit)