I ended up obsessing about the clutch fork angle so I contacted Ram tech support for their assistance. With the curvature of the clutch fork it was hard for me to tell what I was looking at having never done it before.
Here's the details on my setup and the questions to RAM tech support:
Clutch - RAM Powergrip 98764
Flywheel - RAM 1501
Release bearing - Came with the clutch set, measures 1.25" so I believe it's a #488
Bellhousing - Lakewood 15000
Clutch fork - GM 3887177 stock 1978 Corvette
Fork Pivot Ball - 1.5" non-adjustable that came with the bellhousing (and) a 1.66" adjustable Lakewood
I installed everything and used the non-adjustable pivot first to see how things looked. I felt the clutch fork was too far back and looked almost parallel to the back of the bellhousing.
1.5" pivot installed top view
1.5" pivot installed side view
I then replaced the non-adjustable pivot with the adjustable Lakewood unit and adjusted until I had about 1/2 inch of clearance between the clutch fork and bellhousing. The adjustable pivot height ended up at 1.66". Now the fork is pointing forward slightly. I have read that you want a 5-7 degree forward angle on the fork but it's hard to judge the angle with the curved clutch fork.
1.66" pivot installed top view
1.66" pivot installed side view
The RAM support folks said the angle I get with the 1.66" pivot is what I'm after so good news. Now I can obsess about something else.