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I actually did a 5.2 Magnum to a 5.9 Magnum. Totally different.
But for the 3.9LA to a 5.9 is different. It also depends on what kind of 5.9 you got. Like LA which is 91-down. And if it is carbed or is TBI. Which most of the wires, computer, distributer ect will need to be swapped over.
Or a Magnum 92-up. Magnums come stock with MPI which you will have to swap all wires, sensors, computer, fuel pump.
As far a mounting up the engine I believe your stock mounts will work for both engine styles.
Read up on the V6 to V8 swaps in the FAQ2 in this section.
i want to see some good info on swapping an v6 la for a v6 magnum for down the road. something i am interested in. wondering about swapping the tranny & maybe even the transfer case as well?
They should be the same. I know the 3.9 magnum and 5.2/5.9 magnum mounts are the same, so I assume the LA 3.9 and LA 5.2/5.9 mounts are the same as well.