I've added clean copies of the updated gun directors along with red arrows to explain what to replace. I chose the Mk.38 Mod.7 director with a Mk.13 radar for the main battery gun directors (the latest model available). The Mk.37 is a Mod.17 with a "cockpit" for the Mk.3 slewing sight (also the latest model available). It's fitted with the Mk.25 radar, whose accuracy I have not really double checked. Please understand post-1945 equipment items are generally out of the scope of what I draw so I have not checked the Mk.25 radar as much as I have checked the wartime stuff.
I have circled the anachronistic wartime equipment (searchlights, DAK direction finding antenna, and 40mm gun directors) in purple. These should be removed. I might have missed some so check the entire drawing for these.
Anyway, re: the actual design, I can't imagine a "modernized Montana" that doesn't follow along the lines of the modernized BB-61 class ships. That means no dumb autoloading 5" AGS guns, no turreted Bushmasters, and certainly no VLS (we have destroyers that can do that). There is no scenario where this ship isn't just a Tomahawk launching platform, flagship, and shore bombardment ship.
For that matter, I'd look at the New Jersey in the archive and just copy the radar and weapons fit from that but suit it to the Montana's design.
I have to say that I really do like the look of the mainmast you have added.
Why do you have a Mk.56 director abeam the fire control tower? What exactly is it controlling?
Three RAM launchers per side seems a bit much, I would do MAYBE one launcher and locate it aft of the fore funnel.
How is the motor whaleboat launched and recovered? I see no kingpost and no davits.
You should include a large kingpost for UNREP.
Anyway, you complained about me making jokes... so here's some advice.