I would say treat it like a 4-3N-3, but attack him harder because the formation is more defensive, and also illegal, so you will dominate. July lists 4-1-4-1 as the counter to 4-3N-3, you could tweak it a bit, maybe 4-1-3W-2 or 3N-1-4-2?
July's thread says 4-5-1 V, or 4-3N-2W-1.
http://forum.topeleven.com/formation...-what-use.html