Never have heard of one replacing the regulator and having it NOT fail.
Do the whole injector, you can get them so cheap off of ebay.
Also install a new nut kit while you are doing the injector. That is the internal fuel line kit.
Search for CPI injector there and you will find one.
Also, do the normal tuneup stuff while you are at it.
Including:
Cap & Rotor
Plugs (AC Delcos gapped properly)
Wires
Air Filter
Fuel Filter
Remove clean and reinstall the EGR valve
REplace the PCV valve.