Law / Buying an old car in Poland and bring it to Italy [3]

Buongiorno a tutti,

this is Alex from Italy.
I'm considering to buying an old Mercedes in Poland from a private person.
The car is in rather good conditions, but for sure i will have to bring it to Italy on a trailer .
I don know yet if original documents are available, or if there is only a copy of them.
Anyway i will have a selling contract (in Polish and English) which states that I have the property of the car.

Do you think there will be any problem in bringing the car out of Poland?
do you have any suggestion for me?

Thank you in advance.

Alex