Im in the process of rebuilding my entire car. When i build my chassis 4 years ago I didnt know much what i was doing and now im paying for that. My chassis was out of level and square so lining up the trunk lid and doors were hell and the back window was crooked, I finally found out the problem was in my chassis. I used a original 33 frame.. A month ago i bought new frame rails and made my own jig. I can really see a HUGE difference now form switching frames. The body went back together so easy and pretty much aligned it self. But frame squareness is very important I see now.