4WD Front Springs

[jec]

Does anyone know the factory dimension between the front spring pivot bolt and centerline of the upper shackle pivot point at the rear of the spring. This is the center of the frame mounted cast iron bracket that the upper shackle bolt goes through.

My truck (1972 Cheyenne 30) was converted to 4WD and I think the mounting point is about one (1) inch to far forward. The angle of the shackle appears to be a little extreme. The shackle sits at about a 45 degree angle.

Thanks in advance to anyone with an original 4WD willing to take an actual measurement.