I got the new gear from SkyGeek. They actually drop shipped from Atlanta and I got it overnight.
I read the history and also found the Lycoming service instruction (circa 1965). This was about the easiest thing I have ever done.
Throw flywheel in the freezer overnight.
pre-heat oven to 500 degrees.
Bake the ring gear for 60 minutes.
Dropped right on.
In fifteen minutes, it was ambient temp and ready to bolt on.
Thanks VAF.