I have a 235 with the stock manifold that is an exhaust with the intake bolted to it. I have been told that it may be a good idea to not use a gasket and instead bolt these directly to the head, because the exhaust manifold expands faster than the head when it gets hot and a gasket disturbs that process and causes leaks. Also, does anyone here suggest using any type of sealant between the port and the head? I have previously had the intake milled flat and a new gasket, and it stilled developed a leak.
