Body flex

It's a 55 year old unibody put together with pinch welds... waddaya want??? I took Herb McCandless' advice a several years ago and started using US Car Tools' stiffening kits when I built cars. I'm on the third one now. For a street car, a set of factory style torque boxes and the frame connectors really make a big difference! The parts are downright cheap, but the welding work is extensive. The rugs and seats have to be out for the subframe connectors, and you want to be damned sure that the car is straight when to put them in because it would be hell to straighten afterwards.
I looked on their site, it does look like a lot of work