People now a days are happily installing the vitz 1.0 , wala engine in charades. lots of charades have been swapped and mostly done in lahore in pindi. Karachi has a lesser ratio of engine swaps.
i have seen cars with swaps done neatly. if you can find a mechanic who can do it with all alterations and grip to grip wiring making all sensors work, then the expense can reach upto 150k with the vits engine.
otherwise, restore the original 86 engine, get rid of cng if installed.....the engine itself works well if done properly.