I agree on this. I have a TDK frame although, I believe they were AFW then. I wish I had gone with the TJ frame setup, but it was a stretch for the budget to get the frame in the first place. I looked into it again last year before doing my Waggy front axle and the cost to convert the front to coils was still more than I could stomach.I would replace. Cj frames rust from the inside out, so if it looks bad on the outside it is REALLY bad on the inside.
I would personally get a TDK (throttle down kustom) frame. If I was to go back a few months in time I would have done that instead of modifying the stock frame I have. Would have been just a little more expensive but much less work and time invested. (I would have also gotten their cj-tj hybrid frame so I could run a tj spring suspension. Still something I plan to do on a future build.)