Triaged has brought up an interesting point in his concern about roll center height. I have mentioned that it appears brainsboy's setup will have the IC behind the axle, resulting in squat during launch. On the positive side, I could have added that, with the upper links angled as shown, the roll center might very well be nearer the "stock" height, resulting in comparable handling.
In changing the angle of the upper links (as viewed from the side) to cancel squat or rise, it's difficult to keep from raising the rear roll center. This will result in a greater portion of the roll couple going to the rear during cornering. In plain English, that means the car will be looser. Is this significant? Well, I don't tend to worry about it with a V-8 car from the pre-IRS era since they normally plowed terribly, in stock form, anyway. Loosening such a car up a bit is an improvement, in my opinion. But, if you want the stock handling, you can install a heavier front sway bar. In short, the average person will never notice the difference and the one who can also knows how to fix it.
Same with roll steer. Roll oversteer can be an irritation, especially if you've never driven even a parking lot slalom, but, unlike the situation where tire cornering loads are actually changed, the introduction of roll steer is not normally dangerous. If I had my "druthers," I'd certainly agree that roll understeer would be desired. Unfortunately, you usually end up with a bit of roll oversteer, but not enough to cancel the overall feeling of understeer.
I'm a bit uncertain as to what Triaged means by "adjustment." I suppose he means different mounting points for the front of the lower links. This might be a good feature for the serious dragracer. But, I see this as more of a "compromise" suspension for the street car that makes an occasional visit to the dragstrip, so I don't think I'd bother. But, if you want to play around with squat and rise and their effects, you definitely will need that adjustment.