XF is very usefull for CMRR and PSRR characterization.
Output impedance u are able to easy obtain using AC analysis. Just put AC voltage source (e.g. 1V) with 0V DC in series with output of amplifier.
Measure AC voltage at ouput and Ac current flow though output:
Zout=Vout/Iout
P.S. Generally when you simulate OpAMP u should use circuit that compensate offset of amplifier. I don't see such in your setup. Try to search topics about on the forum.