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they're pretty much the same heads performance wise but if I remember right, you don't need special headers or plug wires for the Windsor heads. for the money, look on Ebay or Racejunk for a set of used aluminum heads like Edelbrock Performers or Trick Flows. if it's a stock displacement mild engine, DON'T buy a set that have had massive port work done....it'll kill low end torque.
....unless you plan to build a stroker motor in the near future.
Yeah not to mention the gt40p heads can be had for 400 bucks with a set of headers or you can save and get a really good set of aluminum heads which would be better yet