Bilsteins or adjustable QA1's-best choice as every car is different.
Here is a well mannered high speed big fat B body with lots of welding and few "mods"
The welded k frame is a key piece, do not pass go, do not buy expensive parts or put in the hotchkiss products unless you weld the k frame and box the steering mount.
Do not "over tire" the car. Most cars with big tires/wheels have wayyy tooo much tire under the car. Think 26-27 inches tall 10 inch wide tire.
That's about it for now
Will some one please tell Moparts Tom we deserve our own handling section.