1985 D150 "Mr. Curtis" race truck with a 2015 6.4

Even though I think I'm clever, I find laying it out on the floor with black marker and tape helps. This way my head doesn't get full of the measurements and I can look and visualize.

Putting the upper, lower and spindle together with smaller diameter bolts and clamps or tack welds and no spring can move it through travel and again try and visualize the package. It may seem crude but it has worked for me. Once I think it's close put it together with proper bolts and try again.