I was able to get a successful run in last night after getting everything back together and the idler seems to do it's job.

I still have an alignment issue with the idler pulley as the belt slipped over one rib on the supercharger pulley. The idler bracket needs to be cut down another 1/8" which I should be able to get done today.
edit: I just got it cut down so I can give it a try when I get home today to make sure it's all lined up correctly.
