The gasket should be $10-20. It is not hard to replace, ut is time consuming. You will have to draing the coolant from the block and detach most of everything attached to the intake. You may not have to take the intake all the way out, but just push it far enough back to clear the studs. Use a scraper to take off the old gasket and clean the surfaces as best you can. Then just slip the new one in there and put it back together. There is a tightening sequence for the manifold... Basically just start at the center and then alternate left to right until you get to the ends.