The issue isn't about solid rollers---its about lubercation--- with the new roller lifters that are pressure fed to the rollers, they will go as far as anything in the engine--issue with the FEs are that most of the early or hp blocks don't have lifter
oil gallies so with out the side clearance and squirter
oil holes in the rods, the cam and lifters don't get enough SPLASH type oiling and to further complicate things, every body wants to restrict the
oil to the top end which then eliminates most of the drain back that was designed OEM to drip oil back onto the lifters.
I don't have any pics of the system I built because it was back in the late 60s ---I basicly put two 1/2 tubes down in the lifter galley with -3 lines across to the opposite side into a hole in the lifter boss--inside the lifter bore I had ground a small groove to feed oil to the groove of the lifter---The two tubes were plumbed into the cross over feed toward the rear of the center galley