As far as the ports, I believe the 96-98 intake/heads have oval intake ports and 99-02 has almost square and larger. You wont be able to use the fuel rails from the mustang. And from what iv heard, using the returnless system has no benifit. What you should get if you want a plastic intake is to get one from a 96/97 thunderbird/cougar. Using the mustang intake over a thunderbird intake shouldn't have any gain. I think a thundebird would work better because the port will match up.