Rero fit roller cam & lifters into early block?

Its nice not to have to worry about cam break in that is for sure. When I did mine with Crane retrofit rollers I ran the oil pump with a drill and turned the engine over by hand to make sure no excessive oil bleed out at max lift. I had some so went with a custom ground roller with smaller base circle cam so lifters would ride lower in bores. I hear the Hughes lifters fit better but I would check it anyway.