All the metal that used to be on that lifter and cam lobe, turned to powder, and powdered metal is now distributed all through the
oil galleries. Pitch the cam, and lifters.
You cannot clean the block, head, and crank too many times. Soak it, flush it, and brush it, until you think you are going nuts. Then clean it one more time. Do the same with any part you use out of that engine, like pushrods.
Or you can through it back together and see how may miles it will go, like the last guy did - maybe.