roller rockers and solid roller lifters
Bushing the lifter bore, is not a bad idea, But I have run several motors without that step. Just run a solid body lifter.Comp 829-16 lifters, are a good choice .I know of a few guys running Chet Herberts lifters (about $200 a set) they "seem" to work ok.The comps are about $425, there are rebuildable.
Crane Gold are least expensive choice ($390 mancini's)they can handle up to about 700 lift before they have issues.
JimF