To be certain, I strongly recommend consulting a repair manual specific to your 1995 Toyota 4Runner 3.0L V6 engine. A Chilton's or Haynes manual will have diagrams showing the PCV valve's location and how to access it for replacement. You can also find diagrams online by searching for "1995 Toyota 4Runner 3.0L V6 engine diagram".
Looking at pictures online of the engine bay of a similar year 4Runner might also help you locate it visually. Remember to be cautious when working around the engine – it's hot when running and contains many moving parts.