I think 92 was the dividing year,
Magnum has a few changes the make it different engine family.
block wise is pretty much the same, it’s basically a head package, the main things that make it different for swap, is it’s balanced different than a 360, and the intake bolt holes are a different angel and the belt is a serpentine system, which if you go with older timing cover you can use LA style accessories.
In stock form the magnum heads make a lot more power than LA.
If you google magnum 5.9l vs LA 360 I’m sure you can find a more detailed information.
basically it’s mainly flex plate balance and intake the main issues when swapping.
