67 dart 270

Im about through working on my trunk finally got the spare tire pan welded in and all the holes welded up just a little more and the trunk will be done.The 2nd pic is of my a pillar on the inside if you look close you can see a crack right below the small hole. What caused this? Too much body flex? Its on both sides inside and out.The other pic is when I just bought the car in 91.

2009 more 113 (WinCE).jpg

2009 more 116 (Small).jpg

2009 more 101 (WinCE).jpg