67 barracuda front frame rail rot. any suggestions???

I bought a 70 Fury that some put a cap over the frame.It was one of the premade caps that you can buy.What a joke,it was made out of thin guage metal and you are just putting a metal cap over a rusty frame.I put the floor jack under the frame and jacked the car up and heard a crunching sound.I crawled under the car to have a look and saw the cap,what a joke.Do yourself a favor and replace the frame rail.

Jim