Thanks to everyone that has advised and sent messages.
The series I have bought has a galvanised chassis so I wont be changing that, it also has brand new parabolic springs fitted, so as genem says whats the point in trying to turn a series Landy into a clone defender I already have one of these.... good advise!
Looks like the 200 tdi is the engine I could fit, but is there a difference between defender 200tdi and discovery 200tdi engines.. This is important I think...
I am slowly learning more about the series 3 and becoming more and more attached to the trucks spec.. Apart from the petrol engine...
james