I have the 25/25mm sways, GT braces and springs, volvo strut mounts, billy HDs all around, ipd overloads in the back, volvo rubber everywhere, other than polly for the sway bar, torque rods, and panhard bar...a pretty standard setup. I also have the strut tower spacers that mount underneath the towers (way better than those that go over them). I put 16x7 s80 wheels on 215/55s with 25mm spacers.
The overloads went on first, and the change in rake was significant ... once everything else was done however, the car was restored to its original, flat, truck-like ride height that the stock springs gave it. Without the strut tower spacers and GT springs, the back end might be a 1/4 - 1/2" higher. My takeaway from this experience is that the bushings will give you the most significant changes in ride height. Overload springs will only make a noteable difference if the bushings are shot, and everything else is stock.
FYI I had the moogs for 4 years up until I bought ipd's overloads last month ... I found no difference at all -- they look the same, same number of coils and thickness, and there is no change in performance at all. Ride height was also the same.
In terms of roll resistance, stiffer springs, thicker sway bars, and upgraded wheels/tires are going to make the biggest difference, short of lowering the car. I agree that the 25mm sways are pretty much the best you can do, unless you go with the W123 coils in the back, and diesels springs upfront. You could also try the control arm braces up front that ipd offers. I have heard those make a big difference.
Even with my setup, which some will argue is too harsh/stiff, the car rides more like a jeep, rather than a lifted Lincoln Towncar. It hasn't changed to the point where it feels like a totally different car. It's a much tighter, more precise version of the same sloppy idea, which I will argue is what gives it all of its charm. A 240 is really a light truck in many ways.
(i.e. my daily commute)
