Unfortunately none of the original carburetor items were included with the car, so that's not a possibility. I have briefly spoken to the shop in Carson City that you mention. They gave me the name of a mechanic in Sacramento who works on a lot of Panteras. That mechanic was a big proponent of pulling all the EFI stuff off and going back to a carb.
Really seems like that's the most common suggestion and is the direction I'm leaning at the moment.