I used to work for fiat and Alfa a few years ago and tbh i never did any work to these engines.Imo they were a good engine.Make sure the rear suspension bushes arnt split .The rear suspension arms rhat come from the middle of the car and join on the hubs used to wear.Also the trailing arm bushes that go in the hub used to wear.

Top suspension arm bushes used to wear and squeak too.Front anti roll bar bushes used to wear to.