I'm not certain about the exact machining configuration of your particular intake, but using the three interior bolt -down locations of the intake you could fab a 3/16 to ¼ thick contact plate for the cylinder head face, insert a ⅜ cap screw through the intake bolt hole while threading a flat washer and nut onto the screw in the space between the manifold and head. Holding the nut from rotating, run the ⅜ cap screw in until it touches the fabricated plate on the cylinder head with the nut/washer firmly against the underside of the intake manifold. Set up all three positions on one side of the intake and "slowly", using the bolts as jacks-turning no more than a ¼ turn at a time lift the intake enough to break the Right-Stuff seal. Method is simply a general description and may need to be adjusted for individual characteristics of your particular manifold. I think you will be amazed how easily it comes off when the pressure is applied slowly and evenly. To me, driving in shims or wedges is just a prelude to disaster, but you are not asking for opinions. Good luck.