Everyone's comment are right. If you don't know where it, it is located on the top of the driver's side valve cover. there is a hose connecting it to the base of the carb or to a fitting on the intake. I recommend you pull it out and take it with you to the parts store to ensure you get the right one. Check the grommet it mounts into for cracks or see if it is hard. If, replace it too. It will help keep oil film building up on the valve cover. You'll spend more time getting the cover off and reinstalling than the task itself. If you break the plastic elbow off in the hose simply use some needle nose pliers. Break it in half by squeezing on the ouside of the hose and pull the pieces out. if the hose is hard an brittle too, go ahead and replace it. This will prevent any vacuum leaks causing poor running and performance of the engine.
Hope this helps,