I do not really see it being a too lean issue due to the fuel pump, I would think that would be a jetting problem.
As tireburner said, since the Radiator is cleaned, u can probably rule that out. I agree that it is probably the fan. If u decide to go the Tauras Fan route, I will be finally installing mine next week. Since my car goes to a lot of cruise-ins and the Tauras shroud was too big, I had a different shroud built for mine. I bought the fan from a local junkyard for 20-25 bucks. Here is the artical I am using as a reference piece:
http://www.fordmuscle.com/archives/2...an/index.shtml
AutoZone carries most of the other parts used in this article. Hope this helps.
Ryan