Timing Chain Rail Replacement

O.K., I've decided to replace the timing chain on my 77 450 at 98K miles. How many other things should I also replace while I am working on it? How many of slide rails should I replace? Do I also need to replace the lower slide rails?? (that looks like a lot of work)

[450slcguy]

Do a search on timing chain replacement. There must be a 100 threads dealing with that topic and it's related components.