If you are doing a 115/101 transplant I do suggest that for street use that a 2 plate clutch assembly (stock) is totally adequate. From experience a 4 disk LSD on the street can be scarey particularly in the wet.
I just did the same conversion, but since this thing is supposedly a track car I set it up with 4 LSD clutches.
I also build a modified 115 LSD that fits the smaller ring gears & housing widths of the 101/105`s center housings so that the orig center sections can be used along with the optional 5.12, 5.38 Etc. ring gears. Pics of my conversion are below.
Good luck
Rj