My old dragster was solid, nothing to tune on the chassis but the tire pressure..... Ran 7.90 class with it, most times it was consistent as a bracket car, even ran a few gambler's races with it.

With the shorter wheelbase altered chassis, I would go with a 4 link or ladder bars in the back. Mainly because there is not a big long chassis to flex and absorb some of the irregularites in the track surface. The usual bump coming off the concrete launch pad and on to the black top can sometimes be big enough to bounce the back tires off the track on a solid short wheelbase car. Not fun to be out about 100 ft. and spin the rear tires cuz they were momentarily off the ground. Even less fun if only 1 tire unhooks with solid suspension and the car makes a hard turn!!!! A little suspension on the rear will absorb these irregularities and keep the tires hooked.