LA heads on Magnum block??

Just this week I successfully drilled the oil feed passages from the cam journals to the deck on a 96 5.9 magnum block. A good friend built a fixture (using one of his LA blocks) that bolts to the deck and has a drill bushing at the proper angle. Went slow with lots of lube and the drill came through the oil holes in the cam bearings. This 96 block had LA cam bearings in it for some reason? My only concern was the drill might "walk" and the drill would punch through in the wrong spot. worked perfect on both sides.