James,
Just a note to suggest something you can do to make it easier for everyone to know what truck, engine, etc. you are working on.
If you add a "signature line" in your profile, with details about your truck (make, model, year, engine are the most common factors we look for) other members can get to the meat of your questions quicker as all that info is available without folks having to ask for it. Once it's in your "signature line" it displays in every post you make, so no need to constantly type it in.
As an alternative to Jerry's (Hotrod Lincoln) fix process in his reply, if that plan doesn't work for you, IMO the next best suggestion may be to try and locate a replacement manifold with a good heat riser/butterfly assembly.
Others will surely chime in here if there are other alternatives that they have experience with.
Good luck on the fix.
Dan
