Thanks for the replies, I can understand the restriction in a pure stock class, but even my mildly modified a-body twists something fierce going around corners. This is a CA car that has NO rot and only minimal rust around the rear window-it used to have a vinyl top. Since it's a street car, with only occasional runs around the track, a cage isn't in the cards. I'll be welding the seams and frame connectors, torque boxes and adding gussets....and let the chips fall where they may.