I began mocking up the front frame rails and determined the angle of the new rails to be 2.3 degrees.
2.3 is too small of an increment to split for a miter joint so the rails installed at the center of the car are cut square and the new front rails are cut at 2.3 degrees.
I am only mocking everything up right now as I'm trying to look eight steps ahead and see what I can do now that will help later.
I made the 2x3 cross brace to cap both front rails at the front.
After confirming the distance of 35 3/4" for the locater pins in the leaf springs on the straight axle the front frame rails are installed at 35 7/8" c/l dimension. This is actually about 2" wider than the factory rails were installed.