Originally Posted by 
Casper
				 
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You would be better off with a 300Tdi Deefa tray, just as uncomfortable as a 101 but with power steer and air con and still take a tonne of gear.
Lotza Landys had one for sale cheap on Ebay I believe.
If you were to do long outback trips then go diesel, a 300Tdi will push it along at 80k's but not much more with the 5.5's and the low geared TC and there are plenty of power up options or maybe go the high tech route and go for a TD5.  ...
... A 4BD1T would be perfect but it would be a tight fit hight wise I think but otherwise generally fits anywhere a Rover V8 will fit and a 6BD1T would be even better if you could allow the length which I'm not sure of in a 101.
Good luck though, sounds like a good project and 1 that I would love to do oneday.
Cheers Casper