update - finally
 

Folks,

I've been tied up lately and had a short commute, so not much progress on the vibration issue until this week. My master cylinder was failing (gee 260+K and things just fall apart 8^) ) , so I took the car to a local shop to fix. I had already purchased a new center bearing and flex disks getting ready to go after it myself. They were willing to look at it and use my parts. After the new parts were installed the vibration is 95% gone. They did detect a bit a wear in the u-joint, but not urgent. Thanks again for the advice and hope this helps some others.

Chuck