matt, I know you don't have a Datsun, or a LS3, and don't live in Arizona, but I remember quickly skim-reading this article in last month's Hot Rod magazine. . I know that you know your stuff mechanically. A few months ago I dove into the cooling system portion of my project and I am fortunate that my very simple setup seems to work for me. but for your boosted setup its more complicated and different. It might not gain you any knowledge, but I thought it might be worth a read
https://www.hotrod.com/articles/stop...0hp-ls-engine/