Hi, I have a '66 convertible that was born a 6 cylinder. I have converted the drive train, spindles, and running gear as well as the rear end to 5 lug. I am still getting a bit of sag when both doors are open. I'd like to add more stiffeners to the underside to minimize this sag. Problem is, I can find little or no info about stiffening the convertible chassis. I find loads of info about stiffening coupes and fastbacks, but VERY little about convertibles. Could some of you guys that have convertibles give me some insight as to what I might do to stiffen up the bones of this convertible? I have looked at the underside of the car and it's not at all like the underside of my fastback. Lots more sheet metal under there! I'm about to drop a 5.0 and 5 speed into the car and I'd like it to be receptive to the swap.