Hi,
It's very hard to find a noise, the lifter may have been fixed but you may get a noise from the transmission input shaft or bearing , or any # of places. It may be a good idea to go to a shop with a hoist and listen from underneath the car before you go back into the engine. Also if you feel it's inside the engine , take the valve covers off again and cover the engine and sides with cloths to catch the
oil splashes, and run the engine again to hear the rockers. Chances are a rocker clearance is too much.
Good Luck,
Perry.