It's beneath the oil cap on that cylinder block, just underneath the valve cover-- right in that area. Looks to be installed with two simple bolts. I haven't changed one before, but it looks simple per Gilly's post-- remove the two bolts and replace it. After listening this morning I am not certain this is the timing chain, I'm still wondering. It seems to happen has it has turned colder here. I'm going to look closer at the sound when it starts up and also check further around the car for more information about what it might be. The fan shroud looks fine, I replaced the fan clutch so no noise from there. It didn't seem to make much if any noise this morning.

I have 20W-50 in there and while I realize this probably has nothing to do with it, that weight is a little heavy for this area as it gets colder (we dip below freezing). I'm going to drain that and put a thinner oil in there. For troubleshooting this I may use some Mobile One even though I know this will increase a very very small oil leak between the oil pan and transmission (that gasket) which I know is all but guaranteed as a leak on these cars 100K plus. That's the only fluid leak in the car as an aside. Thanks again for everyone's help. Any further thoughts on changing the tensioner (tips, etc) would still be appreciated. I looked at Chiltons and they suggested what I was thinking based on what I learned in posts here-- that you put the tensioner in a container of oil and you depress it so you can fill it with oil before putting the new one in the car. This makes sense to me, I believe this is a good thing to do before install (?).