They can use the same lifter but there are magnum specific ones too from what I found.
With non-primed lifters at TDC I have .125” of preload and then I can take my thumb on the rocker arm and compress the lifter another .095 to .105” so I’m right in the middle of the lifters’ range I just wonder if shimming the rocker shaft is worth it since it will mess with the geometry ever so slightly. Honestly I’m over this build. It’s my son’s truck and he’s a teenager. Do I need to say more LOL