I am trying to find out how interchangeable are the 46,s? I have a '92 crown vic, a '97 e150 club wagon, and a '98 mustang gt. All have 46's. Are all the blocks and heads the same? Can I swap any of the heads or intakes? I am looking to rebuild the crown vic and if I find a set of cobra heads will they fit? Where do research this type of info.?