hey bro, hope you are doing good, first of all, you dont have a reliable mechanic or electrician, 2ndly Nissan parts are locally available and at reasonable prices, the problem is dont even know the engine and you dont know where to take your car, or where to buy parts for it,
engine swap if done properly works like a charm, and can elevate your drive experience
if you are from RWP/ISB , you can visit me at my workshop, contact number given above,