Brent is an awesome pool of knowledge but if I keep taking his advice on the build I am going to have to be in a full fire suit every time I want to go on a sunday cruise.
I know some guys do it, but I don’t advise any kind of coating or paint inside an engine anywhere, including glyptal. I have seen that stuff flake. Oil drains back just fine without it and I’ve never seen any need for it on any application.