A-body Hemi box 4 speed

I know this is an old thread, But I found my A body hemi box. I've had it 40+ years. Bought it when I was 16 for my Duster. Guy told me it came out of a SS hemi car. He also said the racer knew someone at the factory who gave it to him out the back door. I had it in my Duster until 1978. Has no synchros or dogs. No stamping on VIN pad. Case date appears to be 12-13-66. Real or not?

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