What special needs done to put a 1986 2.3 turbo engine in a 1984?

What special needs done to put a 1986 2.3 turbo engine in a 1984?

Added (1). The 1984 ford thunderbird has a original 2.3 turbo engine in it. Engine needs replaced. I found a used 1986 2.3 turbo engine out of a 1986 thunderbird. The only difference in the engines is injector size. I didn't know if the injectors would have to be swapped and or get a 1986 computer module to make it run correctly or will the 1984 computer module work ok with the bigger injectors. 1984 has 30# injectors. 1986 has 35# injectors.

That depends upon the make and exact model and whether the 1984 car had the same type of engine to begin with or the car itself was virtually the same as the 1986 model.

It could be very easy and straightforward, or it could involve extensive modifications to the bodywork, wiring looms, transmission, brakes and cooling systems.

Ask better questions, get better answers. You know precisely what you're asking about but haven't communicated any of that vital information here.

A better question would be; what doesn't need to be done?