How fast can a stock leaf rearend be?

why do you think the factory S/S cars were hard to beat my neighbor has an original S/S A dart that ran 9:60s with the factory suspension the car(THAT DART) tommy howes once said the only way to beat a mopar S/SA car is with megabucks!! his car was called the HEMI hunter.. im sure there are some members here that knows them.