sure.... I didn't really add much of anything helpful!
I saw on the camaro owners map you are in Fife Lake? I drive through there on my way to work most mornings. My shop is in Grayling and I live south of town in TC so I head over to 131 and take it north to M72. Usually go that way home too if I don't have kids to pick up.
I just finished reading your build thread too. Sucks about that rear end/noise issue. I know I keep mentioning it, but a good place to meet some of the local guys (that might know who does work like this) is probably the Culvers cruise. There are a couple of guys with Vipers and other stuff that must have work done somewhere. Also, if you haven't seen it already, there is a guy on the north side of M186 that is always working on something. In fact there's a group of them that meet every Monday (i think) and build stuff together at his place. I've stopped before, but it's been a while and I can't remember anyone's names. They might have some suggestions on good speed shops.