Most all trucks should have 2 degree caster wedges between the axle and springs, if the rear sets higher then the front, then 3 or 4 degrees caster may be needed. This will help with the rough roads and fun steering. As far as springs go, I doubt you will find an accurate measurements for off truck measuring. At best you can swap parts to get two evenly spaced springs and see how it acts.
https://www.gmheritagecenter.com/do...hevrolet-Trucks/1953-Chevrolet-Truck.pdf This link is from the GM Heritage Center, 1953 trucks, go about 3/4 down and you will find front spring information. You maybe able to work backwards and find a starting measurement. The papers show a 315 lb deflection rate, thats 1" compression for every 315 lbs of weight applied to the springs. If you was to measure yours while on the truck, front, center, and rear, you could then remove one and measure the same points again to see how much they compressed, not sure if any of that would be helpful or not, but it may show something. My '37 has flat front springs, they were designed to be that way, I don't know if '53 have any arch or not, but the early trucks didn't. Tire wear was likely from the worn spindle.
Joe
