SS springs & sliders...

I wasn't trying to be critical , thanks to both of you for sharing this knowledge I am going to go to these sliders myself and will probably look to do something on the offset for cornering as well but not 2 " maybe drill a hole in the side of the rail to move a pair of offset front hangers over more by putting the welded nut in the rail.

No worries, I'm just trying to put more of the information out there.

I'm not too sure I'd worry about re-engineering the leaf spring mounting to include toed in springs. If you did just remember that you'd have to make sure the rear sliders (or shackles) were matched to the angle of toe you put on the spring. E-bodies used an angled spring set up like that. Like everything in suspension, there are advantages and disadvantages to running the springs like that. For the amount of work it would take I would just leave them parallel to the centerline. Some of this stuff is really getting into some pretty small nuances of suspension. Not that it's not important, or that it can't lead to a better tuned suspension, but I think some of it is more like something you'd do after you identify a problem with how your suspension is working. As in, if you noticed that your car was constantly loose on corner exits, you might look into toeing the springs in a bit. But doing that can also cause some rear steer. That may be good, it'll help turn the car, or it may be something you don't like as a driver. And there are other ways to deal with that, like making adjustments to the rear sway bar or rear leaf spring rates.