The end of the lifter has blued, and is probably quite rough... Cam will be shot, plane and simple... Trying to fix something like that without a full strip is just a waste of money!!
Assuming those used and incorrect followers are blued from running inside this engine and not the engine they may have come from, it's easy enough to shine a torch on the cam.
Haha I could go now I have no excuse. Except it's dark. And the van is outside. And it's cold. And 4 miles away. See I talked myself out of it now.
Oh my. You would never believe what I just found. Definitely a bodged rebuild. Look at this pushrod. They are all the same on this side.