The components here look reasonable, but is there a reason why you did NOT choose the i7 8700K over the non-K model?
The i7 8700 runs at a clock speed of 3.2 GHz, but forget about the turbo speed. The clock rate you will be getting from this one is 3.2 GHz, as far as P3D is concerned.
The i7 8700K runs at a base speed of 3.7 GHz, and from what I have seen you can overclock that to 5.2 GHz. Now, that is maybe a little extreme, but you can certainly overclock it to the other side of 4 GHz, and you will need that to get good performance from P3D.
To repeat, "turbo" and other non-permanent clock speeds do not matter, a high permanent clock rate is what you need.
Also take a good look at the RAM and the motherboard you choose. You need the fastest RAM your motherboard can accommodate, especially the so-called "CAS Latency" of the RAM needs to be as low as you can get it.
Note that you should also make sure that the BIOS of the motherboard is up to the latest level as one of the first things you do when you get the system. A BIOS update alone can give you a good performance increase.
Jorgen