based on what information you have, I dont think you have Torsion bars as 4x4s and 2wd Edge models only came torsion bars. Also, you said you have the 2.5? 2008s didnt have the 2.5, they had the 2.3 Duratec Im pretty sure. Also, Sport packages didnt come with 4 bangers, only the 3.0 or 4.0.
With all that being said, if all the above is correct, then you have coil springs and you will either need spacers or lift spindles for the lift (but you can still use the bodylift). As for tires, Im gonna say on a 2wd, I probably wouldnt go above 32" especially with the 4-cylinder engine.
here is a 2WD edge with spindle lift and 32s for reference: