Felpro 1262 gasket, center out cross pattern shown in the manual and rtv in place of the cork end seals. I gasket matched the intake to the heads and it goes together fine. I have never understood how decking the block could change the intake fit, other than it would sit higher on the heads and maybe not line up with the ports or bolt holes. Beats me. I will pull it apart again and take a look to make sure the angles of the manifold match the heads. I am almost positive I am not getting a good clamp on the gasket on the bottom of the 3/4 ports.