I discovered the problem.
Non rally gauges use 3 of the 4 fastener holes allocated for the instrument cluster. I found that I had fastened the one closest to the speedo (5 o'clock) with the cluster mounting in front of of the metal IP frame, when it needed to float behind the tab.
It fit no problem after I discovered this odd sequence, and I do mean ODD.
Truthfully, I can't even imagine how they sold the plant on this assembly process, especially with ALL of the different screws.
I do know that the IP's were built as complete assemblies and decked into the car fully assembled.
Dan