I have my 70 challenger on the road now and have put about 250 miles on her. She's over-carbed with the 2x750's and needs some adjustment and leaning out, but otherwise running fine!
I had what sounded like my right front brake squeaking and occasionally putting out a short squeal. I jacked her up and took off the wheel. The self adjuster pin came loose and the lever and spring were just flopping around in there. The pin was worn in 1/2 from getting caught in the brakes. This could have been pretty bad, because it was only luck that right front didn't just lock up at an inopportune moment, like when I had my wife in the car for a test drive before the seat belts were installed!
Paul