too many will tell you they have seen one but none of them have ever actually worked on one
Yup. A friend has 69 FB Vert Sprint and he had a local mechanic do his. Although the motor runs fine is makes some noises that the OHC shouldn't. Jerry Woodland is the guy to send the head to have a rebuild and/or any machining done. The bottom end is pretty straight forward. Using the 67 and 69 GM Shop manuals should be good to put everything back together minus any improvements made along the way.
Do what I did and pick up a spare OHC to build and install while you work on the one you want to keep.
