this is Magnum. not LA.

Mounts are the same.

everything from the 5.2 to the 5.9 is the same on the Magnum motors, except for the front harmonic dampner, and the flexplate, due to engine balance.

Computer WILL learn the 5.9 at part throttle cruise as the computer adjusts AFR by reading the O2 sensors. The cam on the 5.2 is bigger than the 5.9, so the motors aren't that much different from each other, so as said, stock computer will be fine on a stock 5.9, but if you start tossing intake, headers, etc. at it, then you may want to look at using SCT to get a custom tune.

--Heck, SCT will give you a considerable bump in HP over the stock tunes.