My Challenger was built in the 90's as a ladder bar/a-arm and it had terrible bump steer like that Gremlin. I never noticed it going down the track. I've seen and heard of a few Daytona's and the like getting wrecked. A guy got killed in a 10 sec. Pinto here at Sonoma this year. Seems to be a ton of Vega's and the like running. Big positive caster helps a lot. A 16X16 bead lock rear wheel with say a M/T 10.5W or a "Little Bubba" will help with stability as well.