I agree he has the eyes and the face, but not the ears. Ears aren't the only indicator though, my Hollie is basenji/whippet mix and her ears are more like a whippets, unless she is alerted to something, then her ears stand up. My Hollie has the white legs/feet, face stripe and chest/collar, but her tail is cropped. She too came from a shelter/pound here in TN.
My husband and I have no doubt of her basenji side, her personality is almost ALL basenji. From the self-grooming, dislike of water, the B500, her instinct to hunt and many more off her traits all point to Basenji.
You could always invest in the canine DNA testing… but I don't know who does that in your area. We are in Knoxville... where in TN are you??? Maybe we could get our dogs together to play. Is his name Buddy???
Post more pics when you get a chance.