I have a 63 Nova SS convertible that I just installed a new 4 link setup in. It is a Full Tilt Street Rod 4 link setup. At some point after removing all the original rear suspension I noticed that both quarter panels have buckling just in front of the rear wheels. We installed sub frame connectors as well just in case anyone is wondering. When we rest the car on stands under the front Heidts sub frame and just under the rear section of frame just in front of the bumper the buckles disappear. We thought maybe it was because we welded in the sub frame connectors with the car on the lift so we cut them loose with the car on stands. They did separate about twice the distance of the cutoff wheel. We then mig welded them back in place with the buckles gone. When we set it back on the tires they came right back. I spoke to Clay at Full Tilt and he said he had not heard of this issue from any of his customers whether hardtop or convertible. Has anyone had or heard of this issue? Looking for any help we can at this point.