New lifter install help me understand

'69 318.

I bought a new lifter to replace a suspect bad lifter and I need some help understanding this.

When a lifter is working properly there should not be any give when pressing on it, correct? The one I pulled out could be depressed a bit. When I pulled the new one out of the box I could depress it very easily. I dumped it in a cup of oil pumped it, left it there for a while, pumped it some more and it did not seem to get "right". I put the new lifter in the engine started it and it was super noisy. So what gives? I have read that it takes a while for the lifter to load with oil and get "right". I think I have another bad one as another rocker I pushed on has some give and the others are super tight.