None of the blower bikes use it, and the heat isnt that bad. I dont think you will miss it too much if you leave it out. Saying this, I just installed a new engine with carbs on my exblower bike and put in the shroud. wasnt much of a problem, but I did have the radiator off.
Yup, but that wouldn't help much unless of course your top radiator hose hadn't been installed yet.