1968 roadrunner had crane roller rockers, ran fine under load but valve click at light throttle. had a friend who runs nostalgia with several mopars, he checked it out and said the pushrods were to short,(he has correct tools for this), replaced pushrods and replaced rollers with new stock shafts and rockers. car is much stronger now, pulls hard to 6k, but still has a little valve noise under light load. oil pressure is 40 at idle, 60 at 2000 rpm. sometimes oil gauge quivers at idle, what is going on???

 

Check to see if the rockers are just scuffing the valve retainer?
Also If its a solid cam. The sound might not be so abnormal...