Also if the fan does on cover the entire radiator, fabricate a shroud for it with some aluminum sheet and rivets. Do you have your splash shields installed under the bumper and engine? Also as Bernie mentioned, especially since you are experiencing problems now, you need a overdrive pulley for the waterpump due to your underdrive pulley..Seems like you have everything else covered. There is no way after taking care of these issues that a FMIC can cause the overheating.