Reviews for this block showed that it was on average just a couple degrees Celsius hotter than high end blocks. I figured having an older CPU it wouldn’t be worth spending a lot on the CPU block. This was the one I bought: BXQINLENX Professional Special https://www.amazon.com/dp/B01EMR564Q?ref=ppx_pop_mob_ap_share

I could add an additional heat sink to the loop and mount it to the top of the case. I really thought this 360mm rad would cut it for this system though.