Is this where I pour the oil?

[Mountaineer]

Hi All,
I have a 71 Chevy K20 that in large part I bought to learn more about how to fix up my own vehicle. I've been successful at a few repairs so far, but now I'm on to an oil change. I know, I know... it's my FIRST time every changing my own oil!

I got as far as emptying out the old oil and changing the filter, but now I need to pour in the new stuff and I'm not 100% sure where to pour it in. There was a breather cap on this hole and I'm pretty sure it goes in the hole pictured here, right? (see photo)

Just don't want to screw anything up. Thanks all!