Thank you! Yes, I have good clearance with the Gaming Z. Though with the AIO cooler being 280mm it only fits in the front of the case so it does limit GPU options (cards get too long).
If I were to change one thing it'd be to go with the 240mm AIO cooler and mount top of case so more options available for GPU.
And yes the AIO cooler keeps my CPU quite cool. Never above 65°C and that's with it OC'd to 4.2 GHz.
Sounds like a solid build. If building mid or late 2019 maybe take a look at the R3 3300(x) or R5 3600(x) when they come out. Should be similar in price with better performance.
AMD recommends 2933 but I haven't had any stability issues at 3200.
It is a G74SX. Guess only 8 years old. Corrected description. Seemed longer ago!