Wilwood/Strange 4 Piston Calipers soft feeling pedal

I would say you need the 1 1/32" master cylinder. Unless you have the same problem I had then it will take 1 1/8" master. I beat myself up for a long time with mine until I went with the 1 1/8" master now its high and solid.

I was thinking the same thing. Years ago I had the opposite problem with a 89 Mustang race car I was helping my neighbor with. The brake pedal was hard as a rock! It was then I found out about using a Master Cylinder with to large of a bore. We installed a 15/16 bore on his and BAM! normal feeling pedal. That is why I suggested above that the OP may have the opposite problem.