Pennocks has lots of good info, http://www.fiero.nl

Yes, you can swap the cradles no problem, it will take a
bit of work to do it with the engine in the car. You'll
need to make a wooden bar that straddles the two strut
towers and has adjustable hooks to connect to the front
and back engine lift points, this allows the engine and
tranny to hang while you remove the cradle. The exhaust
will need to come out, but it can be removed as a unit
leaving the crossover pipe still attached to the engine.
Deciding what suspension parts to move or keep while
swapping depends on bolt and component condition. I'd
recommend not removing the strut from the knuckle unless
there is just no other way. Expect the nuts welded inside
the body where the cradle bolts attach to break loose, you
can access those several different ways including removing
the rear bumper or cutting access holes. You might want to
do a thorough inspection of the structural sheet metal of
the car before starting this, normally the cradle is the
last part to rust out.

JazzMan

Yes.  I changed my clutch without dropping the engine.. you have to
support your engine from the hooks that are on top of your motor.  Get a
piece of angle-iron, sling it across the chassis above the motor, use
some all-thread and hook your motor to the angle-iron, tighten up..
there you go... engine and tranny supported.   Remove all engine mount
nuts, remove any other suspension component that is hooked to the
cradle... remove 2 forward bolts on the cradle, 2 rear bolts on the
cradle (make sure you support your cradle or you will drop it on
yourself...)  Done...

-Arlie