Seems there's always a fly in the ointment. Dragaddict was kind enough to send me some measurements from his Merc. Looking at pics of the Crown Vic suspension, and laying a tape on my F-body frame rails, it's obvious the Ford cradle will fit there. My F-body is a hair over 35" between the rails. That's the good part. The BAD part is the location of the Ford lower A arm and how it bolts to the chassis. According to Dragaddict, it sticks back about 18" from the center of the lower shock. Now that works fine on an old truck with a frame that doesn't have much contour, but on the F-body, it would hit the frame. In the pic, the top shows the stock Volare front suspension. See how the frame contours down. On the bottom, you can see the Ford suspension bolted into an old truck. The truck frame has less contour downward so the lower A arm pivot can be simply bolted to the bottom of it. Doesn't look like this will work for me....

Greg