@mohsinalee44, bro since you have mentioned its your first car then engine swap is a big no unless you know someone experienced who will support you.
Secondly, almost everyone will stop you to do any big khurcha on Charade.
I don't want to break your heart, a friendly advice, stay away from engine swap or restoration if you are new, not much experience or knowledge.
Even then if you want to go ahead, roughly engine swap will cost you around 120K including engine installation, fuel tank, fuel pump, gear lever, speedometer but then a 660 engine is not recommended atleast it should 1000cc.
For dent paint, mostly it depends, on average a quality paint job would atleast cost your around 55K. Interior is separate and it also ranges from 10K - 30K.
So roughly it will be a 220 - 240K expenses. Now add the cost of purchase, transfer, registration, please keep in mind the money you will be spending, you will get not back once you spent so think and do your maths as well as market survey.