Individual header tube temp. Egt. Varies

What you have found is normal.
You can correct this with mods to the intake manifold. Ether or both (& probably both) would be to port the intake and add in dams.

Do not make a big deal out of this but do so pay attention to make sure that non of the cylinders are to lean. Enriching the lean cylinder will make the others richer as well. Your in a catch 22. So don’t loose your mind and hair over it.