Anyone have any idea what rear end this is?

autoxcuda said
10 inch drums will be fine. I'm pretty sure the part number for a 10" 74 Dart 8 1/4 rear is the same as a 10" Challenger R/T drum with front disk brakes and 8 3/4. Confirm with www.rockauto.com

Thanks, it being hard to push must just be all in my head.