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Think I'm definitely leaning toward the 5.9 Magnum.
Although I still need to add up the costs. On top of the engine, I'm looking at magnum compatible intake manifold, probably a new carb, headers, electric fuel pump, etc, etc. probably a few things I'm forgetting.



I think the magnum is external balanced, so you may need the B&M flexplate, or put weights on the converter. I don't think you can just swap to a 904 magnum converter because it looks like the input shaft spline count changed?



Your thinking LA-360,
The 5.2 and 5.9 Magnum engines are neutral balance just like a 318. You can absolutely bolt up a 904 to a 5.9magnum, just have to use the magnum flexplate, and your neutral balance 904 - 318 torque converter.

Been reading up on this stuff at magnumswap . com