There are different views concerning the setup of multiple blocks within a closed circuit. Some favor using a "Y" to split the water flow through the blocks (parallel configuration). Others (me included) prefer a series configuration where the flow is not spit and the velocity of the water through the blocks is maximized.
In practice I believe that there is validity in both schools of thought. I am a firm believer in testing results yusing various configurations and going with what is best for your particular circumstances. That is what I do with all my projects.
There is no one set answer as there are so many variables that impact cooling e.g. back pressure, component placement, number of elbows and tees, pump capacity, radiator design, radiator fan selection, case cooling, and many others.
The pump you intend on using is tried and proven and should be sufficient for what you are planning.
To be honest, I do not believe that the difference between the parallel Vs series circuit for the components you propose is going to impact temperatures more than +/- 2 degrees C.
Best of luck in your journey. Half the fun is getting there!!
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