So here is the run down for 2.5L NA to 2.2L NA with a couple of variations.
Option 1
Find a '99+ 2.2L na with the same style valve covers your 2.5L has. This 2.2L should have single port heads allowing you to use your current exhaust manifold and IIRC the intake is the same as your 2.5L(or will work). This option is as close as you get to a direct plug and play swap.
Option 2
You do the same as above but you have to use your intake and wiring.
Option 3
you use any 2.2L NA shortblock with your 2.5L NA heads along with your intake, sensors, wiring and exhaust. Not plug and play will work.
It is a very specific 2.2L that is a direct swap.
Notes:
Some 2.2L are dual port heads, which will not bolt up to your exhaust or intake.