11" Backing plates rubbing

I just put a real a body 8 in 3/4 rear and the back of my car 1970 Dodge Dart.. My backing plates are 11 inch... I found used 11in drums but not what sure if they're off of honestly but I slid them on and they fit I was told it might have been off of a barracuda.. I was told my back and plates are from a 73 New Yorker.....with rally wheels on....when I tighten up the Lugnuts on the the rims The wheels don't turn. The drums are making contact with backing plates edged. when I put the wheels on without the drums everything spins fine.
.I'm not sure if they're supposed to bleed smooth or if they're finned drums.
Possibly just the wrong drums?