Paisa lag jaye ga lekin i will try to help you.
1st of all Change the ignition coil to a latest one that use to come on Cultus.
Pani wala masla show it to some dentor get that sorted
Change the radiator to charade original 3 nali diesel one you can find that in 2nd hand market.
For noise change the door pins.
Suspension check karwao front it should be in good condition for smoth ride.
And last side gap your plugs that will boost the performance for more info how to do it goto link below.