Late Range Rover

       I am a subscriber to your wonderfull magazine Petersens 4wheelandoffroad and love it, recently i came accross a late model 3 door Range Rover with a V8 engine and twin carbs, all original, I would appreciate it if you could direct me to a website who specializes in Range Rovers, The engine is practically shot, leaking oil on the exaust manifold and with an engine knock like that of a caged psychopath wanting to break free, I am interested in rebuilding the engine or if theirs no hope put in a rebuilt engine that is also original, are  there any downsides to this engine? I'm from the Philippines by the way so rummaging thru junk shops is out of the question. Any help would be greatly appreciated, Thank you.