How to get rid of understeer in a 1970 340

Many people think lowering the car makes it handle better. I like the lowered look, but the new angles the control arms are sitting at causes the front roll center to drop, which makes the car roll over easier, which really sux as far as handling goes. Many people like Bilstein shocks, and tons of people have nothing but bad things to say about the KYB Gas-a-Just. I like QA1 Stocker Stars. About $150 each for single adjustables. Wow! What a difference they made on my Charger. I had purchased them for one of my Darts, but the Charger needed them more. There was a rear sway bar available in '76 only. It mounted on the frame, and the ends connected to the shock mounts on the springs. I'd get that type, not the ones that bolt to the differential. I'd check bump steer. The tires could be turning as they move up and down on acceleration, and could feel like understeer. Our racecar had 1/4" of toe change per inch of suspension travel, and played havoc with the controllability upon braking into turns. A quick and dirty check is to put the car on stands, with stands under the rear axle, a jack under one of the lower control arms compressing it until the front of the car just lifts off the stands, and then lower it and see if you can see the tire turn left or right at all. Ours was easily visible, although I made a fixture with a dial indicator so I could dial it in to less than .020" toe change per inch of suspension travel, which is what you want.