Welcome to the forum and congrats on your 280CE! That's not a common car by any stretch of the imagination.
The W123 never handled like a Subaru BRZ, but if the handling is really sloppy, the 38-year-old suspension is probably shot and going to need a total refreshing if you want like-new handling. All the rubber is probably shot. The parts alone cost >$1,000.
BTW, your post might be taken more seriously if your post title wasn't comically misspelled and in all caps. Just a tip

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Where do you live? A member might be able to drive your car and give you an independent evaluation of how the car handles.
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"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____
"Your sense of humor is still loco...
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1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod
2 Samuel 12:13: "
David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."