now i know someone is going to accuse me of being negative with my somewhat dismission of the SC but...
An NA setup on a zetec is going to take tons of cash to see any real gains...unless you're going to slap some nitrous on top of that build up I see you spending a buttload of money without alot of gain.
However on a positive note, it would make for a good solid engine...the #'s just wont be there. Never hurts to do somethin new though...if your pockets are deep enough make it happen.