What breed is my kitten/cat Dillion?

He is about 8 months old. Healthy as could be. We have tried looking it up, but the only thing we have found is that he had the markings of a mackerel tabby. Our problem is he has larger ears and feet than a typical cat of that kind. Plus his claws, when fully extended, is longer and curls under more than normal cats. We know that he is obviously mixed with something, but we just don't know what. So if you could help, it would be much appreciated