Make up a list of all parts that are different/ better between the na and turbo model, then work out what each one will cost to buy and install if it needs to be upgraded. Then factor in more costs for when things don’t go exactly to plan
then think about the legality/ insurance side of things. Will your insurance cover a turbo converted car in the case of an accident?
i personally would not do it unless you have some strange emotional attachment to the car.