Search the threads with tag 'compression test' goto any reasonable mechanic or work shop in lahore get compression test done if engine performance is deteriorating due to rings and fuel efficiency is declining go for ring job only. At least the engine you have in the car you know the history and maintenance rating.
Engine swap will be highly expensive and you also have to put the new engine number on the regn book, 'in desi style' resale would be down to 50% - there is workshop in lahore by name of moon motors ask around other members for their opinion for the place.