At the risk of sounding like your father...again.
Not all cars are able to handle the extra HP and heat
(in stock form) that a turbo adds.
Heads usually get '0' ringed, along with better head gaskets... There are many internal parts that have to be in known good condition, to make it a worth while mod.
It gets even worse on a car with a lot of mileage.
Enjoy the free car and maintain it for as long as you can, while saving for something you really want. This car can be a stepping stone to a job and making some money.