The main tensioner on mine still had a lot of material left on the rail itself, but you can see the grooves. The chain, main rail, and tensioner assembly are typically what is replaced when doing the timing chain. The PITA portion of the repair is removing the lower pin for the main rail (actually any pin, since they are in there pretty good).
The rest of the chain replacement is straightforward. Be sure you've fastened the master link in properly before buttoning her up. Use the correct tool for the job.
