Thank you for thinking of the puppy's needs.
Please, contact the breeder first if you signed a contract. Responsible breeders have contracts, nearly all requiring you contact them if things don't work out. They may have other homes waiting already. If the breeder sold you the puppy without a contract, then there are a few here looking for a puppy that might be interested. Make sure you get references and vet references so that your puppy goes to a home, not someone wanting to use him for breeding in some puppymill.
If you can't find a good home and you are willing to place without being paid, BRAT can be helpful in screening and getting into a good home in most cases.
California has a separate basenji rescue also... http://www.basenjirescue.com/ ... however, I have no idea if they do fanconi testing.
If your pup does not have clear parents, or at least one clear, please get him tested before you place him. A home getting a dog with a genetic disorder is more likely to abandon it if they don't know upfront what they are getting. If you have the parents' registration numbers or names, it is easy to verify if they were tested.