what valve seals after machining guides?

Not lash, the actual lift loss due to the extreme pushrod angle induced by the roller lifters due to their height.

Springs will be the hughes 1110

Stock valves

I would like to see how close i can get to 400 on just motor with what i feel to be a very basic combo and just paying attention to the details, then i will put a little gas on it for so fun to see what the magnum can handle.