Please do not put a lexus in.
My father has one in his safari and has been regretting it ever since . When it sees mud or water it starts it troubles. Just like the v8 cruiser the alternator is way to low and gets clogged with mud easily. The starter sits in the v of the intake manifold which has 2 small holes to drain water but if it gets clogged the starter ceases.
There is a reason so many lexus converted vehicles are for sale, they only realize the mistake afterwards. So few truly sucsesfull sories around that I have heard. a Conversion wil allways need tinkering in my opinion.
It has great power and the most positive Lexus engine I have heard about is the 4.3L.
If you are deritmined to buy one do so with the original harness and engine management. Keep your manual box because the 4 speed automatic quickly overheats especially in sand if not propperly overkilled cooled and searches for gears when towing.
With the manual gear box and avoiding mud and water I think it is a good engine that wil perform well with sand and towing and a pleasure on road.
Fuel consumption you will hear stories about 10-15km/l but around 8 is more realistic.
There are a few diesel magicians on the forum and I have heard the sounds of their 4.2 with turbos. Heavenly roars comparable only to old propper generation V8's
So maybe not a rebuild but a newer engine with some persuasion from a turbo...
Looking forward to other replies.