I used Edelbrock 1220 intake set that is
antifreeze resistant. Also used a Hi temp sealant called "The Right Stuff" and applied it to the front and rear of the intake ends with an extra dab on the corners where the intake meets the heads. It comes in the form of a caulk that is also resistant to
antifreeze and hi temps. THE CAULK IS USED IN PLACE OF THE END GASKETS...
To make the installation even easier try installing intake studs about 2 1/2 inches long on the 4 corners of the heads and drop the manifold spot on to the engine.