I can't remember who, but somebody makes a 130 tooth flywheel that's balanced for a 5.9 Magnum. An LA 360 flywheel is balanced differently. Glad your crank is drilled deep enough.....now all you need is one of those roller pilot bearings.
@Rainy Day Auto did a post a few weeks back talking about 360 external balance Flywheels for 4 speeds. Someone had a picture for machining a flywheel to fit a 360 external balanced crank. Probably different than what you need for a Magnum 360