[SixtySixDeuce]

The 318/360 swap will always have some quirks. Most things will bolt up (driver side engine mounts are different). But the engines use different oil pans (rear bearing caps are different) and 360's are externally balanced (this can be changed, but it's spendy). On the magnum engines, the 318's use a bellhousing mounted crank sensor instead of a distributor mounted cam sensor. Not a big deal going 5.2 to 5.9, though. You will need the PCM for the 5.9l truck if you want it to run right. You will also need the 5.9l TC or flywheel. This is where you may run into problems, as 360's were never mated to manual transmissions in Dakota's and 5.2l trucks usually got a 42RE or 44 RE trans, while 360 trucks are 46RE. I am not sure the converters can interchange (or that the PCM for the 5.9l truck wil be compatible with the 42 or 44 trans). Best bet would be to aquire the 5.9l trans as well. If your truck is a manual trans and you are rebuilding the 5.9, I would suggest having it internally balanced so that you can use your flywheel. This is what I did with my '51 pick up so that I could use the baby torqueflight I already had rebuilt.
As far as parts compatibility from LA to magnum, there isn't much. It's similar to GM with 2nd gen SB's vs. Vortec engines. Esentially the same engine, but heads, intake, exhaust, valvetrain-all different. Addionally, the water pumps and timing covers are different on the LA and magnum engines.