72 Dart Swinger 3.6L Pentastar +T5

Maybe I missed it in your thread, but what application T5 are you using? I'm wondering about your input shaft length as will as the length of the bellhousing plus shims.

I have a Ford Racing "Z-spec" T5, M-7003-Z
upload_2018-7-1_19-43-29.png
Post #50 has more dimensions
Posts #167-180 has detailed pictures of the adapter plate and bell housing.