1974 Dodge Dart Magnum Swap

"And, as I stated, early 5.9 EXTERNAL Balanced, Later 5.9 Internal balanced. Ask me how I know?? See above:)"

Ok I will ask how you know? Because none were internally balanced from the factory.
Although the pre-Magnum ('71-'92) and Magnum versions of the 360/5.9 are both externally balanced, the two are balanced differently (the 360 Magnum uses lighter pistons) and each requires a uniquely balanced damper, flywheel, drive plate, or torque converter.