/6 to magnum mount options

I am pretty sure the first run Magnum engines did not have the truck mounting bosses in the block, only the old style LA mounts. But all later Magnum engines from the trucks people call "first gen" from 1994 on do have the truck bosses because that is what they used.
I have a 1993 D250 truck with it's original 5.9 Magnum engine still in place, and I know the history of this truck. I will have to double check it to be certain, but I am pretty sure it only has the old LA style lugs. It will be at least this weekend before I can check it.
Just did some checking in the parts catalogs, and it looks like you're right- '93 (first year for 5.9, second year for 5.2) fullsize pickup and van was still using the biscuit style LA mounts, which makes sense- why change it when the platform is getting updated the following year. I would venture to guess that the truck mounts are still there, since the Magnum mount lugs were already being used on Dakotas (at least the 2wd ones- looks like 4wd used the LA mounts on the Magnums, too). '94s appear to have gone to the Magnum mounts across the board.
Learn something new every day.