go with a 3s its cheap is comparatively fast and reliable!!
if your current engine is in good shape it will cost u 30000 to 35000 for the complete swap with gear!!
if u buy the engine + wiring + ecu it is for 44000 and the gear for 15k . your current should sell b/w 15 to 60000 depending on the condition it is in.
4afe are also available but they are **** expensive! like 125k for the swap
wont recommend a 4age because since its parts arent available anywhere.
MAKE SURE YOU GET UNCUT WIRING TILL THE DASH BOARD wiring is a pain in the *** when it comes to alterations.
i would recommend you to do a complete swap deal with the kabari which will include EVERYTHING i.e. engine ,sensors,wiring,mounts,gear,fuelpump,AC working,AC pipes, "NO ERRORS" in ecu ,NO JUGARS,nuts,bolts............
all u have to give them are oils,and the AC gas