Viper Dart Suspension questions

That sounds maybe a little on the heavy side for the engine, but I don't know what all you're including either. I've heard closer to 700 pounds for the Viper on, not sure about the truck V10 (iron block vs. aluminum). Either way I think you'd be okay, they have some pretty hefty torsion bars out there, but I might consider strengthening the torsion bar crossmember and K frame to be safe.