pull the intake & mock it up with some composition side gaskets/no front or rear gaskets & check fit (bolt hole/port alignment). If good install it but dont use the supplied front/rear gaskets but instead use a wide carefully placed swath of clear silicone on the front/rear rails instead. Clean the mating surfaces 1st and let the intake set up overnight before starting it up. EDIT if there's any dowel pins on the front/rear rails pull them & toss em