Was looking up the Tickford fuel pressure regulator in a Bosch Fuel Injection Spares book at work yesterday and it said the engine code for the 4.0L I6 was 'H' (in the same spot were for a Nissan it may have 'CA20DE' or a Toyota '3YC').
Anyways, first time I've ever seen an engine code put in a cataloge for these cars and I remember someone posting up and asking if they had one a while ago so I thought I'd share.