70 340 4-speed dart - talk me off the ledge

anyone's thoughts on the auto rust tech's frame rail caps? they look like will be the quickest way vs. full rail replacement.

I have used them. The rears were never the right width. I had them make 2 sets and neither fit my rear frame rails so I made my own. The front cap I used from them was a perfect fit. I also had to reinforce the torsion bar sockets in the crossmember, but it wasn't in as bad of shape as what yours looks to be in. That's a tough call. Pretty bad rust there, but I've seen guys take on a lot worse. Might need to cut out the whole crossmember and swap it out for a better one and cap the frame rails. Or replace the frame rails too which I wouldn't even want to think about personally.

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