Just got around to replacing the both the idler pulley bearing and the tensioner assembly. Made a huge difference in quieting down the engine noise I was experiencing. The idler bearing was an easy press in press out. Pulled a chinese 6203 out and replaced it with a Japanese made Koyo. My plan was to do that with the tensioner pulley until I pulled it apart and noticed it was a plastic pulley with a captive bearing. I bought a delco replacement assembly since the tensioner spring seemed a little weak. Both bearings were dry and growly but still spun freely. Hopefully replacing collector gaskets will quiet it down even more, but every time I think about doing that job I look at those bolts and think its probably going to take twice as long than I think it should, and something is probably going to break.
I also found out that the steering wheel shaft boot had pulled itself out of the firewall. Probably explains why I felt a lot of hot air on my feet during the summer months.