Blueprint 408 cooling system questions.

A proper shroud will help at all speeds. Without it, the system will not be able to cool at full capacity of the radiator core. You need to be careful selecting an electric fan, they aren't all a sure thing and they put a higher load on the alternator. Cold Case is a forum sponsor and they make nice stuff and can supply the shroud and electric fan package too if you want to go that way. Members may get a discount but you'll need to check with them.