Sorry but I'm new

Count the valve cover bolts. If there's 10 on each cover, it's a Magnum.
If there's 5, it's an LA or a Magnum with LA covers (yes, they fit).
Look on the sides of the block, there should be "Magnum" engine mount bosses at mid-block:
upload_2022-8-30_22-49-48.png
A Magnum will also not have a provision for a mechanical fuel pump on the timing cover, unless it has been swapped for LA parts.
The dead giveaway are the engine mount bosses.