... The current handling situation of my T-Bird is that of a 16 foot boat out in rough seas. It was so bad in fact, that it was briefly nicknamed "The Boat" by some of my friends. ...
I have three cars, and all three have completely different suspensions.
Lazarus is the best handling:
Frame bracing, IRS brace, rear STB.
Koni Shocks for a Tbird.
Sport Springs F&R, new poly cups in rear.
Mark VIII rear LCA's All Poly rear bushings, including diff. Bolt thru rear Diff mount.
This car is stiff as fuck. It drives like it's on rails.
I have to readjust the konis spring and fall, or they're too stiff or soft, but it takes like 30 seconds.
The rear springs need about 5/8 turn taken off, it's too tall. I blame the poly cups, they're a bit taller than the Originals.
Tokico shocks bought in 2010 from Amazon as a kit; with
Purple variable rate springs. Reused spring cups.
Drives very well, Comfort noticably better than Lazarus. Date Car.
Not floaty, but has to be 'set' into hard turns, to precompress the soft part of the spring, otherwise it can move around a bit.
Rear shocks have gotten more bouncy since they've been on, but they have 100k on them now.
It's sitting currently, but it has Gabriel shocks on it; They were getting sloppy when I blew the engine. I thought they were ok shocks until I bought the Konis, lol.
They last about 3 years before they lose it.
Monroe will feel ok for a year, maybe, lol.
I have a NIB set of sport shocks for it, when I get it running.
Gabriels were the best "Car part store" shocks I found.
If I replace the shocks on the Tbird, it will be with the Mitsu-3k bilsteins from this thread for the front:
And either the Mustang Koni or Bilstein rears.
I hope this helps!!