Barracuda sag

The frame connectors are installed. I did it with jack stands under the suspension. They are US Cartool and welded at both ends and underside the floors. I have torque boxes coming. The car has minimal rust. Full rocker and quarter have been installed on driver side. The trunk has a touch of rust but overall is solid. I have heard racers of yesteryear used to weld up the unibody frame at the joints. I want to avoid a roll cage as this is a street car.
Thanks for the input. My next step is to have a second set of eyes to see what is flexing. And weld in torque boxes at the rear.