First small block Mopar build More than a little nervous

So after running brand X for years, I took the plunge and started running not one but 2 Mopars.
I have always been a fan but you can build brand X for pocket change and get parts at your local 7-11.

I am in the slow and tedious process of building an LA based 408 stoker, I had the short block done local and at the moment it is a great ornament sitting on the stand in my garage.

As money permitted I have gathered the other parts I need, however now I am second guessing myself on if I understand the small block mopar valvetrain to assemble the engine.

I have read all I can get my hands on but my brain is stuck on brand X valvetrain, I have the feeling that I might be overthinking it, but the more a read about the geometry the more I get confused and feel that I might have bitten off more than I can chew.

There is allot of great information on this board, some of the tech write ups are amazing! Can anyone point me to a good source of information on setting up the small block valve train, I have zero experience setting up a non adjustable shaft mounted rocker set up.

I know that at some point to have to just jump in and learn as you go, however I am trying to avoid costly mistakes and I know that this is old hat for many of you.

Thank you for your time and consideration.
What head are you using?