Tranny is on.
I'm not sure what the problem was the first time I tried to mount the tranny, but I dissassembled the clutch, tried the disc on the spline, mounted the tranny without the clutch in place and every thing mated OK.
I re-assembled the clutch and tried again and managed to get it together. No interference from the S-10 clutch on the bellhousing either. The clutch cover had to be pulled quite a bit to the flywheel, but I'm assuming that normal enough. Everything spins nicely. The arm pivot bolt that I made from the mercedes lug has lots of room for future adjustment.
The Getrag came with a blue speedo gear for use with W-1062 speedos. My speedo is KPH and is marked 557. (It's always been 20 KPH out with the 4-spd)
Obviously, I won't use the blue gear, but what is the gear that comes in the Getrag for, and will I have to change it?