SMall Block retro fit roller lifters
I put the Hughes lifters in my motor, with a 2000 5.9 cam. Worked well, other than having to clearance the block a little to get the lifters to drop in (not their fault IMO). My lifter bores are chamfered, pretty sure the Hughes lifter are designed for that possibility so it shouldn't matter (mine didn't).
Don't forget about pushrods, those will be custom (Magnum ones were too long for me). I ended up using a shorter set of Ford pushrods, lifter preload was like .080" which seems too much to me, but Hughes said that is about right. Been running all summer and no issues related to that.