You must be a certified masochist to buy that car in Pakistan, you cannot get the fuel for the engine here in Pakistan, the GDI galants were a JDM only. If you want to buy it for its shape, buy a dead GDI galant and put in a 6A12 or 6A13 in it, (Legnum engines).
I have succesfully swapped a 6A12 in a 98 Galant VR-G and hooked up everything to work as original including the touch screen A/C controls, rad fans, gauges, electronic automatic transmission etc, The V6 was smooth to drive and trouble free for sure as it was just a plain 4 stroke engine with injectors sitting in the inlet manifold operating at 40 psi compared to the injectors sitting in the combustion chamber operating at 1900 psi
The 6A12 you need is from the same year Legnum/Galant or something similar (space wagon) RHS mount type engine, but you would need the wiring harness uncut or have to get it from UK or Japan (I got mine from UK)