It's an NA. I'm certain its not all the lifters. Maybe a few though. I am apprehensive of just swapping out the ticking ones. With my luck, soon as everything is done, some other ones will screw up to...
I haven't tried ATF since i did the Xtreme Clean Engine Flush but I'm debating on it to try and save time and money. The engine flush did nothing though so I don't know if it's worth my time.