RoundHead

I would like to remove the Intake manifold from my OMC 2.5 Chevy engine. On this engine, the Intake and Exhaust manifold is one item. The Manifold is held on by a sequence of nuts on studs that are sticking out off the engine. The Manifold is cast in such a way, that there is absolutely no room to fit a Wrench on the nuts. I can fit a socket on the nuts, but there is absolutely no way to fit a ratchet handle on the socket and there is no way to fit a universal fitting on the socket... there is simply no room. Does anyone have any experience with removing this Manifold? Do I need to make a tool myself? Is there something available on-line? (I have been looking, but to no avail) Thank you for your suggestions. Andrew