The elbow is a relatively inexpensive part from AD or Bomac less than $250 if memory serves. It is my understanding that the manifolds no longer exist so replacing it is going to require some digging.
looks to be a easy fix to me & way cheaper than new. You guys in salt have way more corrosion problems but not having to shovel snow may be worth it. Had the riser & elbow off of the port engine last year & they still looked new no sign of any deterioration of the metal, original 1987 parts. I know my boat has been to the Bahamas twice from Chicago with a PO.That would probably work for what I see but I think I would prefer to just build up by brazing and mill or file the gasket surface. In any event, a good soak in the tank and a bead blast job are in order before making any decision.
Could be AD has old Bomac stock. Anyway,it has to be worth trying a repair.... Bomac emailed me to say the manifold is no longer available. today I get an email from Bob smith ADC to say they have them in stock! If I can get it fixed I save $1000...or Bomac loses $1000...same thing either way..what gives with those guys? I sent them a complaint...don't they know what they sell?
I took it to Industrial Engines Annacis Island Here in BC and they tanked it and the elbow and did a total reno on the manifold right down to the gaskets and red Lehman paint...
You think they charged too much?