"I issue a warning to all those pushers, to all rip-off artists, to all muggers: It’s time to leave Detroit; hit Eight Mile Road! And I don’t give a damn if they are black or white, or if they wear Superfly suits or blue uniforms with silver badges. Hit the road."

Above is the quote that matters. Notice he was telling drug pushers and drug offenders to hit 8 mile and established that rule would not be applied selectively based on a person's race.
It is frustrating that I continue to hear people claim Young told white people to hit eight mile.
And yes, it should be 1974.