Roush Saleen suspension geometry..different to a regular GT ?

Edge,

On your window sticker it may say Saleen performance alignment. As far as I know nothing was changed at all except adjustment of the steering bump stops on the later cars (99-04) because going from 8.5 to 9" wide wheels they rubbed on the swaybar. Unless your car came with the optional Saleen C/C plates there won't be anything else different going on there.
For the record, you wouldn't want some Saleen alignment specs anyway as a competent alignment guy will give you the correct amount of camber. I like the look of a little negative camber on the front wheels but only your guy depending on how your front end is set up and what kind of shape it's in can determine the perfect amount between ZERO camber and neg.