Big block cooling issues

He asked. Make sure that you cardboard your pretty radiator fins.

Yeah, he asked how to install the radiator shroud. But unless someone used bolts that are too long, there's absolutely no reason to remove the radiator. 5 minutes with a ratcheting wrench and you're good to go, no need to drain and remove the radiator. Especially since it's unlikely he'll be reusing that super long spacer.