WTF: Guess the engine of this Hilux!

The first generation Toyota Hilux was a big improvement over the Toyota Stout: it was roomier, more luxurious and longer wheelbase.
Guess the engine Hilux RN10
The only thing it lacked was a potent engine, especially in the modern days it may look a bit archaic.

The owner of this Hilux solved that by swapping out the 12R engine for something else. Can you guess what it is?
4AGE engine in a Hilux RN10
WTF?! A 4AGE? That is the least expected engine in this Hilux: if you want to haul freight you need torque and not a rev-happy engine!
On the other side: imagine getting passed on the highway by a first generation Hilux revving at 7800 rpm! Would give me goosebumps!

Found at Sakayans Blog