Using the original frame for my 31 A build. I welded in new front cross and kicked the rear up 5 inches using the rear cross sold in Speedway. The rails are straight and I built the frame on a level floor using weight and tie downs to keep frame from drawing during welding. The frame is also boxed. Long story short, I have fab skills and did the best job for what I had. I got a half inch twist from right front horn to back left corner. I can stand on one corner and someone can stand on the other and the frame goes flat and is level. There is no middle cross installed as of now. I'm thinking the weight of engine, trans and body will help level out the frame. I'm going to bring the frame to level when I install middle cross. Will the stress cause problems later on when car is on the road? It seems the front cross is where the stress will be, as it has to give to let the frame go flat. The rear is built much heavier.