66 cuda

Pullback on the arm(spring loaded)there should be lever on the arm down by the stud,pull that lever out,let the arm down and should come off.May need to rock it back and forth if its stuck.May need a screw driver under neath or
something to give you leverage without damaging the cowl,should be enough shoulder on the stud if you have the right sized screw driver/tool under the arm to pry.