The motor mounts I believe will work, you might need to stack some washers in one side. If you buy new motor mounts even if listed as 73-78 340 or 360 Dart mounts they will probably be the 318 mounts exactly like you already have. To use the 727 from a 318 you either need the external balance flexplate, or add weights to the old converter, or buy a new externally balanced converter.