Back-halving the car is allowed in Super Stock ( within the parameters of the NHRA rules ) Stock Eliminator doesn't allow it. I believe this car has been around since before the days of Cal-Tracs and it's common to take advantage of the rules to gain the larger tires and utilize a 4-link or ladder bars. Since the advent of Cal-Tracs you do see some Super Stock cars retain the stock style rear suspension, that was the whole reason John Calvert invented them, so he wouldn't have to tub his original '68 1/2 CJ car. And remember that it's still important to make consistent runs, big tires help with that.