News:
'72-'74 pedals are more square, while '70-'71 pedals are more trapezoid in shape. I also think something is a bit diff. in the cage like a hole in one or the other; can't recall. But they will interchange; just won't be correct if the wrong year is in your car.'70-'71 style:'72+ style:E-bodies, you have to look at the kink in the brake pedal as well as the shape of the cage.
I believe that strap is there just to hold the pedal in position. Without the clutch to resist it's movement, once it goes a little over centre, it will snap down quite hard.
Still have all your finger tips? I hope?