ok, I have an 86 5th ave. Leather interior, moldy. 318 lean burn converted to a 2bbl w/ reg ignition. I also have a 1979 lebaron 318ci 2dr. I need the rear out of the 5th because its the 8 1/4. the lebaron has the 7 1/4. swapping them. i have a 360 magnum i'm swapping into the...