Everything will bolt up fine except the Intake bolts on the magnum engines goes straight down from above but the LA intake bolts go in at an angle. The Magnum heads can be redrilled or you can get a 4bbl intake for a magnum.
The 5.9 magnum oil pan is the same as the 360 but the 5.2
I have heard differing opinions on them.
I have installed a LA 360 oil pan, pickup and pump on a 5.9 magnum so I know for a fact it fits.
The exhaust ports are different but I believe the LA exhaust will fit. I plan on using a set of Durango headers on mine.