If that 3 litre single cam Diesel has no turbo, whilst it will be a bit sluggish on the open road, at slower speeds such as in town and especially off road it muight well come into its own.
Most NA Diesels have masses of low rev grunt, there's no flat spot or point at where the power suddenly drops because you've dropped below suitable revs for the turbo, also virtually impossible to stall, i ran NA Diesels for years and whilst they were obviously underperformers on the open road, they were miles more flexible at slow speeds pulling without complaint right down to tickover, no turbo turbine blocking the exhaust either, so long as the swept volume was big enough they were fine both in lorries and 4x4s, Fiat (or was it UNIC) used to fit 8 cyl 19 litre NA Diesels back in the day if my memory serves, you needed a bloody good trubocharged wagon to stay with one of those, there's also a 30 litre V10 NA monster made by Isuzu, the torque from must cause road damage.
I wonder if the 3 litre mentioned is basically the same engine as was fitted to my 70 series (KZJ70), a turbocharged 3 litre 4 pot but with mechanical pump and injectors, only rated at 123bhp but masses of torque, it would pull a house down and was virtually impossible to stall, coping right down to tickover revs and you could still hear the turbo spooling away the engine wanting to deliver, still miss that old girl, selectable 4WD on those.
Compare to Discoveries of similar age with the 2.5 4 pot engine, so gutless that they wouldn't even drive up onto the transporter (artic transporter with very gentle approach and deck angles) unless you selected low range, they'd just stall out once the revs dropped below a certain point and any oomph from the tubbo instantly vanished, Mitsis were just as bad, compare with loading new Hilux and Landcruisers no such faffing ever needed, they'd romp up the decks no matter what gear you were in.