Update - I called Scott at SACC (thanks for the tip Ron) and he had one Wilwood master/line kit left on the shelf so I bought it. I was going to get the master from Summit Racing, but I didn't want to spend 3 weeks sourcing the line and various adapters that are needed. Scott's price was very reasonable for the added parts. I did have to use my OE clevis as the supplied short clevis did not work with my early '72 (non-effort reduction).
I did end up modifying the pedal box AL plate ilo of grinding on the master. The minor hole changes are not visible and you could still use an OE style master if a future owner wants the OE look. Given all of the changes that are made to Panteras, enlarged holes should not be upsetting to future owners.
I have around 100 miles on the Wilwood and the fluid looks like it just came out of the bottle - as it should. Plus, one less failure mode as the reservoir is integral.
My vendor graciously agreed to provide a refund. They share the same frustrations that we have!
I appreciate the advice/help that everyone provided.
Next project - installing a Fluidyne rad/Flex-a-Lite shroud combo!