Possible, maybe, difficulty, don't know. Fit is one issue, as it is 2 cylinders longer. Bell housing won't even come close to being the same, adapter plate will be needed. Clutch mating is another story, don't know the combos to make such work. Motor mounts are another, and invariably the radiator hoses will be on the wrong side.. In basic, it is not something that is a direct swap in the slightest.
Bell housing is different on the 2.3 lima
the 3.0 is a unique bell housing also.
the easiest swap for a 84 would be a 2.8l they are a carb engine a feedback carb but still a car but it has a different bell housing alo.
A 2.9 will fit and parts are available you will need a different transmission and a different fuel pump as it is fuel injected.