Hi Robyn–
Thank you for your response!
Yes, I have been in touch with Sally, and she helped me find two of Spencer's sibs. She added his litter to her database, in the hopes that it might help others searching out lines.
Unfortunately, back in 1997, it was not widely known that the Mountain Springs people were using the respected Cambria name. I didn't even know that Mountain Springs Basenjis existed until recently. My little B didn't come from there, but he is descended from Fanconi lines that apparently did. I'm sure there are many, many more like me, and I did make the breeders aware of it. I'm not sure it helped, but maybe it was a step in the right direction.