I was wondering, I was think about buying some heads from a local salvage. They are the gt40 heads off of a 5.0 explorer. What is different? And I use my trickflow intake, stock headers? Are they worth it? They are $100 a piece complete. 90 guaranty. Also I ws looking in summit and see the JET Performance Adapted thing... And is that any good? A ford tech that it works well for getting rid of the 94-95 junk.. Is this true?