I can recommend Quantum Mechanics in Oxford, CT.
I have a Twin Cam with the same transmission and in my Seven, I use the remote shifter version. John did a full go through of my transmission and I ended up getting a bellhousing from him later as the one I had was too small for my clutch setup, even though the bolt pattern was correct for the block. Good luck!
It was a fun start to a somewhat brisk day. We enjoyed meeting some new folks and we had nice conversations. Thank you for coordinating the meetup.
Tim
To be honest I do not recall this being particularly difficult when I did it. I would recommend dish soap or some spray silicone to help it slide into the channel.
Good luck!! Tim