It seems every time I crawl under one of the 1963 Impalas I realize something is different from the other. The frame that is currently under my 4 door parts car is the style with the rear part of the frame being made from box tubing. Plan was to use this frame in the Pro Street car where pretty much around the back third of the frame is getting cut off if not more. Now my convertible has the open "C" channel type rear frame and while it is fairly solid I was planning on boxing it and addressing the factory welds during the frame off restoration of that car. Now the question is when I wack the rear of the box tubed rear frame would it be worth it to keep it and put it on the Convertible? Or should I look at doing the reinforcement of the boxed tube frame and add body mounts and just use it under the convertible? I was thinking I might look to see if it would be worth trading the frame with somebody if these frames are worth more than a C channel frame, but I worry with this option about getting someone else's problem like a bent frame or worse. Any other thoughts on this?