No idea, sometimes with mixes it's so hard to tell what the parentage is. I do think that your dog's head is a bit more refined than many of the pit mixes i've seen.
We got Killian from a breeder in Ohio–-Jim Edgerton. That's where he had gotten our previous male basenji. We took Logan and Jasmine to his place and looked at several 1 year olds and a puppies and Jasmine eliminated the others and we agreed with her pick.