I'm using a Crane solid roller cam and lifters in my LA with .456 lobe lift and after looking at it I don't need to tube the oil galley or bush the lifters. If you put the cam in then one set of lifters at a time you can look down the galleys from the front and rear (plugs removed of course) and see how far the lifter has to come out before it uncovers the galley. My block and cam/lifter combo has at least .100" before it uncovers the galley.
The smaller .420 lobe lift roller I had only had about .035" before it would uncover the galley because the smaller lift cams usually have a larger base circle so you have to check.
