Changing manifold gasket on W27

Thanks to all who responded to my question of where the antifreeze in my Westerbeke 27 was going.

Based on suggestions from Joe and others to change the manifold gasket, I chose that route and yesterday started disassembling everything so I could see what was needed and order all parts at once.

It was when I took the tape off the water/exhaust elbow and piping I knew this was not going to be a quick fix.

See photo at http://www.pbase.com/easystreet30306/image/113186299

The water/exhaust elbow itself is painted red and is in good condition, but from there on things go downhill.

Connecting the water/exhaust elbow to the manifold are five other rusted 2" dia connectors and pipes. There is a cast 90 degree elbow screwed into the water/exhaust elbow. To the other end of the cast 90 degree elbow is a 3" long x 2" dia joiner pipe then a connector, another 3" x 2" dia joiner pipe and finally a 30 or so degree elbow which screws into the exhaust manifold. Rust is the predominant colour.

Questions are as follows.
First, how the heck do I get this disassembled? Is it a case of getting a much bigger pipe wrench or should I be soaking it in PB or other.

Second question is what should connect the W/E elbow to the manifold, or is this the way it’s done?

Thanks in advance for all assistance.

Chris

Easy Street, 30U #306
Toronto.