supercharger gasket is called a upper plenum gasket. its ablut 12 bucks for a gen 3. gen 5 is a metal reusable gasket.

once the lim is off, lay some rags in the valley up the sides to under the intake and coolant ports on the heads, then clean your heads matting surfaces. scrap with a razor spray with brake cleaner wipe em down till they are clean of any crap.

the egr side of the lim and sc will need the most work to get the old gasket off. its baked on in that area.