Bhai first of all it is difficult these days to find a G10 engine... Which your Cultus has!
If you are willing to change and spend some money. It is much better tofind an EFI g10 from a later model along with all the wiring and the sensors... And the instrument cluster..
It will cost you around 100-120k just the engine. And you can find it in shershah. Which is closed due to lock down.
Stay Home Stay Safe Brother..