My suggestion is cover both bases. Do what you want, new engine gearbox, diffs suspension and soundproofing the interior, BUT keep all the original parts protected, not rotting in a paddock. This means if the value of a series 3 with matching numbers gets tempting, it's much easier for you to drop out the new engine, gearbox and diffs as the previous good nick original items are in the back of the shed soaked in oil.
A lot of the uk series owners drop in ex disco or defender tdi's and gearbox with lower diff ratios. Also 2.25 series diesels are less common so a well preserved original may be worth a bit more in the futur, this could be a good reason to take it out and rebuild/box it for x years and put in the engine you want.


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