help with modern valve guides

[ksousa]

I hate to be so naive, but I'm naive.

Stock '29 RPU with original drive line. We had one stuck valve and one that was broken.
I bought a new modern valve set from Mike's Affordable or Snyders (can't remember which one).

The one piece valve guides have a little step on one end where the OD is a little bit smaller than the rest of the OD.

1) Does the end with the smaller step go towards the top or the bottom?
2) Do I install these from the bottom and push them up, or from the top and push them down?
3) And how do I know when they're all the way "in"?

thanks in advance.