serpentine conversion recommendation
Pretty sure none of the Magnum PS setups will bolt to an LA, nor will the Magnum tensioner. The LA head is missing some of the bosses, and I know the block is missing the boss for the truck PS bracket. Not sure the missing boss on the block is that big of an issue, but the missing bosses on the head are more troublesome.
I was going to try and convert my '91 Dakota 318 to a Magnum serpentine setup as an intermediate step before doing the full 5.9 Magnum swap due to the '91 tensioner failing again, and that is what I remember running up against. In my case, the '91 only timing chain cover supports the PS pump so that wasn't a big issue, but the tensioner didn't work as I recall.
The '91 Dakota 318 timing chain cover would be one way to get around getting a PS mounted, but you would still need to build some kind of a mount for the tensioner.
There are certainly a couple of bosses that match up between the LA and Magnum heads, but as I recall there isn't anything there to make things stable as the LA head doesn't have the 3rd bolt to form the triangle.
Now, if a set of Magnum heads were swapped onto the LA like I've done on my Duster, it works great outside of the missing boss on the block. In that case, I would just use the Jeep bracket and pump as they just bolt to the head. But a full LA doesn't work in my opinion.