From research I've done they should and the 2.3 pinto header will too! Sounds like fun I plan on taking mine to the track eventuallyYes, Mustang II . I am going to drag race the 87 2.3 with a 5 speed . I understand from other forums , that the 2.3 headers for the Muatang II will fit the fox body 2.3 engine bay. Just making sure before I buy one.