Your engine has a single row timing chain which would normally be changed around 100-120k miles , if you don't know whether yours has been changed I think now might be a good time.
The chain ,tensioner and guides should be changed at the same time. If this is the original chain I would think you would need a cam sprocket and crankshaft sprocket if the chain is badly stretched, as the teeth will be badly worn and the new chain will wear rapidly if they are not changed.
You will be able to tell if the sprockets are worn as the teeth will have a hooked profile on one edge instead of being symettrical in profile.
Hope this helps , Geo.