^bro it depends from where u get the work done
swapping an EFi is not a big deal these days ....... 100's of pakwheelers even have done it ....it jux requires a lil heart and proper resources .....buy a complete engine with original ecu with grip to grip complete uncut wiring and a good fuel pump thats it .....its a matter of 2-3 days and everythings fine if u go to a proper mechanic
^^
overhauling in PAK is useless these days cuz these are pretty common engines .....mostly the price of overhauling exceed the price in which u can get a complete head assembly which is much more durable