Ohh RWP @rajaatta sir if you can help the person out please. If I remember correctly you are from RWP.
Bhai if it is a 1990 it is not a margalla it is called a Suzuki sedan, with a Suzuki g10 Cultus type engine. It is underpowered because it is a 1.0ltr engine with a 1.3 body.
Anyways all the parts are available. Damn easy to fix. It would be rather informative that you post some pics of the car and the damaged area so we can suggest a better solution.
Plus don't go and listen to anybody to change the engine, first get it's compression test done to check the engine health and then decide...
Also @dani_kk Bhai is in ISB.