I don't know the Detroit area Friday cruises but the Diner between Birch Run and Frankenmuth has a cruise nite on Fridays.
Swing by Stuttgart Germany and I'll roll with ya. I'm missing my wheels back in Ann Arbor. Did see a 55 (or 56) Buick in the road here...in a sea of smart cars and VW's the thing looked as big as a Kenworth.
Kinda late notice, but I will be in Davison, downtown... pretty descent cruise there every friday night starting at 5:30.