McBoney, you get this assembled you have to promise to post pics (as you assemble and of the final assembly) and give us an evaluation of the upgrade...
That being said...from the 85-90 Softail manual
Diaphragm Spring Adjustment
Lay a straightedge across the face of the diaphragm spring. The spring should be within 0.010. If the spring is bowed outward (convex), the adjuster plate is moved to the next hole position for greater compression. If the spring is dished inward (concave) the spring is moved to the next hole of lesser compression.
If an adjustment is required, remove bolts by backing out each alternately 1/2 to 1 turn until spring pressure is relieved. Position adjuster plate at the mounting hole which will give the correct adjustment.
Reinstall bolts and tighten in a across pattern to 6.5 to 8 ft lbs. Adjust hand lever.
Place steel discs and friction discs alternately over hub abd onto drum starting and ending with a steel disc.
Position hub and drum onto mainshaft.
Attach hub nut (left hand thread) 50 to 60 ft lbs
Stack pressure plate, spring diaphragm and adjuster plate against hub with holes aligned (NOTE: the convex side of the spring diaphragm must face out when reassembled
Insert washer and bolts and tighten to 6.5 to 8 ft lbs.
One other thing they note also is the the retaining ring (circlip) must have the beveled edge facing outward upon assembly.
Adjust diaphragm spring