That rear end should be centered from the get go. Did someone altered it to begin with? I would imagine that if you are putting that axle under a roadster it would need to be cut down anyway because the FSB is quite a bit wider than your 32 is. I know on the Early Broncos the axle width is 56" and the 9" does have one short axle, but that is for the spider gears inside of the housing. One axle shaft will go in further than the other because the gear cluster is offset, but the housing it'self should be centered.