Professional products balancer: which weight for magnum

You can even use the 80012 balancer with 91013 weight to replace the one piece factory serpentine drive hub on the newer Magnum engines when doing an engine swap, if you had one of those newer engines to begin with.
So basically, this balancer and weight combo fits all 360 Magnum engines, you just have to choose pulleys as needed, and don't forget about the Magnum weighted flex plate or torque convertor, whichever you have.