10 inch front drums on the back

I was sorting the brake drums out from my ebay69 barracuda today and noticed 3 of them were identicle? I guese you know what that meens. Any body ever heard of using front drums on the back of an 8.75.I wasent positively impressed but thats what he did. I wonder what kind of trouble you can get in doing that or if you can get away with it. OPINIONS