Front Frame Rail Evaluation

This company used to make rust repair kits for Mopars but not any longer.
Mopar Archives - autorust.com

I had a similar situation with my 69 cuda. The front rails rust from the inside out. The picture you show of the side of the rail tells all. That metal is paper thin and if you keep driving, the T-bar anchors will twist out. Guaranteed. The "repair" you show is ok in some areas but absolutely terrible in others.

To do this right at a minimum:
Front rusty floors need to be removed. You will then be able to see the inside of the rails where they go under the floor.
T-bar crossmember must be replaced. AMD has them.
New or rust-free rails need to be welded in. See those upper suspension mounts? Check those too.
New front floors to finish.

My car had been in an accident and besides the rust, the left rail and lower radiator support were bent. I straightened that but after further evaluation did exactly what is shown in post #5 above about 25 years ago. Bought a complete front clip including rails, t-bar crossmember, inner fenders, and radiator yoke. Drilled out hundreds of spot welds to remove the old clip, blasted and rust-treated the "new" clip and welded it in.