Ok i have a ke 35 with an 18rg in it so engine bay and crossmember set up is similar, as stated you need a rear sump so hilux 18r sump and pickup fixes that, a w50 box fits with some fabrication to the existing crossmember, you need a new exhaust a shortened tailshaft and a better diff because you will break the original one.
Only real problem in mine is clearance between carbies and master cylinders, not an issue for you as your master cylinder is on the opposite side.
can't see why it wouldn't fit yours but wont be a simple conversion but shouldnt be to difficult either