If its a Euro 323 it will have the distributor on the side of the engine VS the front of the Cam. If this is the case a good deal of the engine parts are not the same as here in the USA. the ECU computer is also differnt.
So if you blow the engine youll need to get a 2.5 from and IS car. OR do the twin cam swap. There also is a good video of the 3.5L big six swap as a drifting car.

I have TWO 323 euro cars. so when your ready to get rid of the engine let me know.