Magnum 318 info

Sounds like the best solution would be to sell the 46RE and find a 904 / 727 to mate up to my 1996 318. The OEM wiring harness is for sure a throw-away. Chopped all over the place. The 46RE was rebuilt in Sept of 2015 with a new convertor. Pan is clean and looks fresh inside. Any idea on what it is worth? Will any year 904 / 727 bolt up to my engine ( exclusive of a / 6 )?