Traction bar question

I'm considering some Comp Engineering traction bars for my '73 Nova. I definately want "old school" traction bars, not Cal Tracs etc. My question is how do they ride on the street? The reason I ask is my buddy way back in high school had a set of Lakewood Traction Action bars (the ones that replace the spring plate) on his '71 and everytime he went over a bump, the "safety" u-bolt at the front of the bar would hop up and down, knocking on the top of the leaf spring. Is that normal or did he have the safety u-bolt snugged too tight? It was, in my memory, always touching the top of the leaf when at rest.