As for the bounce, you didnt say if the Cap was lowered, and if so how and how much. You may be low enough that you are bouncing off the bump stops. Or if you have cut springs it may give you that ride, among other reasons, ie. shocks. The B-bodies are known for making a popping noise when making a full turn. I believe it is a ball joint issue. You can do a search and find tons of info on this.