Mechanical vs hydraulic valvetrain

I disassembled the short block last night but didn't get any of the lifters out of the block, I think they're mushroomed. I assumed they were hydraulic because of the previous owners claim and can't see them well from the top.
I think they're solid, it makes sense because every other component in the valve train appears to be.

Thank you for your responses, sorry for the ignorance. This is my first slant, I'm learning. It's crudded up from lack of maintenance.