what valve seals after machining guides?

Yes they are factory roller lifters. Theres no geometry issues persay, its just the fact that the lifters are so tall it put the pushrods at more of an angle so you are not transfering all of the lift in the vertical axis, some is absorbed into the horizontal axis aswell.

I was just trying to get an idea how much lift is soaked up by that to get a good ballpark for total lift at the valve.

You seem to have a figure in mind based on things you've read, maybe use that as a general idea and go from there. You're probably aware that there is no way to possibly know for sure until you actually measure. Plus, every combination of parts is going to yield a different answer, especially when dealing with production tolerances.

Regardless, if you are concerned about poor geometry by eyeballing the pushrod angle, you should know that you can correct it by getting the proper length pushrods.

In lieu of that, AR Engineering makes an inexpensive fixture to facilitate checking valve train geometry/lift. See here. I would think that plate is exactly what you need if you want an accurate answer.

That's what I would do; get a pushrod checking tool and the AR valvetrain plate since those are a minimum expense. The labor would cost nothing except your time. Install your parts and run the valve with the pushrod tool in place. Take an initial reading to see how close or far off you are to the desired lift. Adjust pushrod length until you find the sweet spot.

Here's a pic of the plate in use.