You were going 140mph on 40 year old shock and suspension....

Step up and get some new parts. KYB's at least all the way around, and swaybar kits are as cheap as $99 now. How much caster is set up on the front end? Are your lca bushing worn? steering box a bit loose? Seriously, look into some upgrade. If not for safety, you would enjoy the better handeling car.