Yes it can be done, but the budget will exceed keeping in view the prices of engine and parts.
u will buy a cheap fx to remaining under the budget but still it will need some body works as well as mechanical work.
it will go over 200k budget becuase when u spend money and efforts on the car then it should also look good other wise its a not worth the efforts.
u can search youtube, there are some videos who have altered the fx and mehran with 660cc engine.