If your chassis is not rigid enough, all the traction enhancements in the world won't make it right. Since this car is a 12,000-mile original A12-code Plymouth, we didn't want to bring chassis members through the firewall under the hood. Herb McCandless showed us how to bring them through and tuck them into the front wheel well. Team chassis builder Shawn Kennedy also tied the subframes to allow a controlled flex rate. We have the chassis stiffness we need, but the cosmetics are better-preserved as befits a collectible, low-mileage piece.