suzuki cultus is a local car. every item be it electrical mechanical cosmetic or engine repair is available OEM new,. Your best option is to rebuild the engine.
however before we rant further you shall mention your city. may be there is a contributor or a trusted workshop which can help you. Engine health can only be determined by a compression test wet & dry.
an educated sane professional will never tell you, just by sound of engine, about its health.
