Yes, those are the lifters. It's not uncommon for them to get slightly cup-shaped on the bottom and be hard to pull through the bores they ride in. Pull them up as far as they can go and the cam should slide out underneath them after removing the screws from the thrust plate. Then drive them out from the bottom side using a hammer and punch. A cupped lifter is junk and should not be re-used. Ditto for the cam they're riding on! New lifters have a slight convex shapr on the surface that rides the cam so the lifter rotates.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!