I am working on this swap as well, but from a 4l60e in an o2 gmc.

I heard the driveshaft will work with going from the 4l60 to the M6, so I am not worried about that.

Did you use your stock clutch master cylinder? Did it work out ok with using the t56 slave cylinder? No release problems or pedal sticking to the floor??

Did you use your stock hydralic line between the master and slave cylinder?