I was going through the construction pictures of the Lever Family dragster and there was one particular picture that caught my eye. It showed the lower tube rail with an upward bow in it as it was attached to the frame table. When I built my Bonneville lakester, it's like a rear engine dragster but all enclosed, I built it with the lower rail flat and secured to the table. The result was that it has a slight permanent sag in the middle because of all the heat that was applied to the roll cage ( Bonneville cars require more tubes and thicker wall tubes, thus more hear from welding).
On a 200 inch wheel based fed how much bow goes in to it and where is the center of the bow located? Or is no bow needed because less heat is needed to weld the frame together?