['63GENIII]

My '63 leans about the same amount but on the passenger side. The only difference is that the front shackle on the passenger side has a little more angle. By a little Im talking within 5 degrees of the drivers side. Its driven me crazy for the last 8 years! In two weeks, Im swapping in a set of 52" springs into the front and at that time, I will make sure that the new rear shackle eyes and front spring hangers are in identical places. I can't tell you how many times Ive measured my frame with a straight edge and plumb bob only to come to the conclusion that the hanger was installed just a little off at the factory. Not sure if this is what you have going on with yours as well but its free to take a tape measure and look.