if your current WP does not leak...no reason to replace it. If it does, than yes and also pull Opti to inspect inside for any coolant contamination. At that point if the cap & rotor have more than 75k mi on them than replace with a quality cap/rotor kit. Many, including me, use the MSD cap/rotor
Once you remove WP inspect spline coupler for wear including teeth on WP drive gear. clean/grease inside of coupler and install new "O" rings on WP drive spline shaft & wp drive spline. These are included in the FelPro TC gasket/seal kit for about $12. The WP drive seal is a likely suspect to start leaking after a WP swap so many chose to replace it during this swap. It is also included in the TC gasket set.
Get yourself a Haynes service book for refrence of repair procedures.
Mike offers the hoses & plastic restrictor & "T" through the ebay links.
\'96 BBB 383/T-56